4.7.0 Preview 8 - Widget broken, causes crash

I switched from 4.6.1 to 4.7.0 preview 8 - Just because of the weird bug in 4.6.1 with event dispatchers that causes compile error.
So, i just convert my project to 4.7.0 and now the event dispatchers work fine, but now a have a problem with my existing widgets.
When i just startup my project and click on play it causes a crash with following error

Assertion failed: ((UObject*)ContainerPtr)->IsA((UClass*)GetOuter()) [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Runtime\CoreUObject\Public\UObject\UnrealType.h] [Line: 357]
'UI_EditorOptionBrowserEntry_Bool_C_0' is of class 'UI_EditorOptionBrowserEntry_Bool_C' however property 'IntProperty_97' belongs to class 'TRASHCLASS_UI_EditorOptionBrowserEntry_Bool_157'

If i goto my widget where the widget UI_EditorOptionBrowserEntry is created and when i remove just the execution node from Add Child than i can launch the game. If i than reconnect the execution pin i can still play and launch the game. If i close the editor completely and reopen it, the same problem occurs and i need to do that step again.

Here the relevant part in my widget blueprint

Here the full crash report

MachineId:4F916D4A43AD77FB300EBD8F3C8D955F
EpicAccountId:18cff6de94764e17b0223dbb6ce423a5

Unknown exception - code 00000001 (first/second chance not available)

Assertion failed: ((UObject*)ContainerPtr)->IsA((UClass*)GetOuter()) [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Runtime\CoreUObject\Public\UObject\UnrealType.h] [Line: 357] 
'UI_EditorOptionBrowserEntry_Bool_C_0' is o

KERNELBASE + 35740 bytes
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() + 292 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor_Core!FOutputDevice::Logf__VA() + 248 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:144]
UE4Editor_Core!FDebug::AssertFailed() + 1079 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:224]
UE4Editor_CoreUObject!UObject::execInstanceVariable() + 488 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:975]
UE4Editor_CoreUObject!UObject::ProcessContextOpcode() + 141 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1451]
UE4Editor_CoreUObject!UObject::execLet() + 78 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1249]
UE4Editor_CoreUObject!UObject::ProcessInternal() + 1644 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:602]
UE4Editor_CoreUObject!UObject::CallFunction() + 2707 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:516]
UE4Editor_CoreUObject!UObject::ProcessInternal() + 1644 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:602]
UE4Editor_CoreUObject!UFunction::Invoke() + 180 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:3684]
UE4Editor_CoreUObject!UObject::ProcessEvent() + 3036 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:924]
UE4Editor_UMG!UWidget::TakeWidget() + 404 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\umg\private\components\widget.cpp:256]
UE4Editor_UMG!UScrollBoxSlot::BuildSlot() + 102 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\umg\private\components\scrollboxslot.cpp:22]
UE4Editor_UMG!UScrollBox::OnSlotAdded() + 108 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\umg\private\components\scrollbox.cpp:47]
UE4Editor_UMG!UPanelWidget::AddChild() + 490 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\umg\private\components\panelwidget.cpp:120]
UE4Editor_UMG!UPanelWidget::execAddChild() + 122 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\umg\public\components\panelwidget.h:12]
UE4Editor_CoreUObject!UFunction::Invoke() + 180 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:3684]
UE4Editor_CoreUObject!UObject::CallFunction() + 1112 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:395]
UE4Editor_CoreUObject!UObject::ProcessContextOpcode() + 141 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1451]
UE4Editor_CoreUObject!UObject::execLetObj() + 430 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1292]
UE4Editor_CoreUObject!UObject::ProcessInternal() + 1644 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:602]
UE4Editor_CoreUObject!UObject::CallFunction() + 2707 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:516]
UE4Editor_CoreUObject!UObject::ProcessInternal() + 1644 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:602]
UE4Editor_CoreUObject!UObject::CallFunction() + 2707 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:516]
UE4Editor_CoreUObject!UObject::ProcessInternal() + 1644 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:602]
UE4Editor_CoreUObject!UFunction::Invoke() + 180 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:3684]
UE4Editor_CoreUObject!UObject::ProcessEvent() + 3036 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:924]
UE4Editor_UMG!UWidget::TakeWidget() + 404 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\umg\private\components\widget.cpp:256]
UE4Editor_UMG!UUserWidget::MakeViewportWidget() + 90 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\umg\private\userwidget.cpp:596]
UE4Editor_UMG!UUserWidget::AddToViewport() + 85 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\umg\private\userwidget.cpp:624]
UE4Editor_UMG!UUserWidget::execAddToViewport() + 112 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\umg\public\blueprint\userwidget.h:114]
UE4Editor_CoreUObject!UFunction::Invoke() + 180 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:3684]
UE4Editor_CoreUObject!UObject::CallFunction() + 1112 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:395]
UE4Editor_CoreUObject!UObject::ProcessContextOpcode() + 141 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1451]
UE4Editor_CoreUObject!UObject::ProcessInternal() + 1644 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:602]
UE4Editor_CoreUObject!UObject::CallFunction() + 2707 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:516]
UE4Editor_CoreUObject!UObject::ProcessInternal() + 1644 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:602]
UE4Editor_CoreUObject!UFunction::Invoke() + 180 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:3684]
UE4Editor_CoreUObject!UObject::ProcessEvent() + 3036 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:924]
UE4Editor_Engine!AActor::ProcessEvent() + 259 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\actor.cpp:529]
UE4Editor_Engine!AWorldSettings::NotifyBeginPlay() + 342 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\worldsettings.cpp:119]
UE4Editor_Engine!AGameMode::HandleMatchHasStarted() + 426 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\gamemode.cpp:602]
UE4Editor_Engine!AGameMode::SetMatchState() + 141 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\gamemode.cpp:711]
UE4Editor_Engine!AGameMode::StartMatch() + 83 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\gamemode.cpp:579]
UE4Editor_Engine!UGameInstance::StartPIEGameInstance() + 1545 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\gameinstance.cpp:218]
UE4Editor_UnrealEd!UEditorEngine::CreatePIEGameInstance() + 8708 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\playlevel.cpp:2861]
UE4Editor_UnrealEd!UEditorEngine::PlayInEditor() + 7184 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\playlevel.cpp:2212]
UE4Editor_UnrealEd!UEditorEngine::StartQueuedPlayMapRequest() + 643 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\playlevel.cpp:974]
UE4Editor_UnrealEd!UEditorEngine::Tick() + 3604 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\editor.cpp:1226]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() + 22 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\unrealedengine.cpp:347]
UE4Editor!FEngineLoop::Tick() + 4179 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launchengineloop.cpp:2257]
UE4Editor!GuardedMain() + 1404 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

Here the full log from editor startup

LogInit: Version: 4.7.0-2448202+++depot+UE4-Releases+4.7
LogInit: API Version: 2448202
LogInit: Compiled (64-bit): Feb 16 2015 23:29:01
LogInit: Compiled with Visual C++: 18.00.21005.01
LogInit: Build Configuration: DebugGame
LogInit: Branch Name: ++depot+UE4-Releases+4.7
LogInit: Command line:  -debug
LogInit: Base directory: C:/Program Files/Epic Games/4.7/Engine/Binaries/Win64/
LogInit: Rocket: 1
LogTaskGraph: Started task graph with 3 named threads and 6 total threads.
LogOnline:Warning: No default platform service specified for OnlineSubsystem
LogInit: Presizing for 0 objects not considered by GC, pre-allocating 0 bytes.
LogInit: Object subsystem initialized
LogConsoleResponse:Warning: Skipping Unknown console variable: 'UIScaleRule = ShortestSide'
LogConsoleResponse:Warning:   Found in ini file 'D:/TDMN/Saved/Config/Windows/Engine.ini', in section '[/Script/Engine.RendererSettings]'
LogConsoleResponse:Warning: Skipping Unknown console variable: 'UIScaleCurve = (EditorCurveData=(Keys=),ExternalCurve=None)'
LogConsoleResponse:Warning:   Found in ini file 'D:/TDMN/Saved/Config/Windows/Engine.ini', in section '[/Script/Engine.RendererSettings]'
LogConsoleManager:Warning: Console variable 'r.MSAA.CompositingSampleCount' wasn't set (Priority ProjectSetting < Scalability)
LogInit: Selected Device Profile: [Windows]
LogInit: Applying CVar settings loaded from the selected device profile: [Windows]
LogInit: Computer: BRAIN
LogInit: User: BrainFooLong
LogInit: CPU Page size=4096, Cores=4
LogInit: High frequency timer resolution =3.417966 MHz
LogMemory: Memory total: Physical=11.9GB (12GB approx) Virtual=131072.0GB
LogMemory: Platform Memory Stats for Windows
LogMemory: Process Physical Memory: 46.93 MB used, 46.93 MB peak
LogMemory: Process Virtual Memory: 26.61 MB used, 26.62 MB peak
LogMemory: Physical Memory: 3823.84 MB used, 12152.95 MB total
LogMemory: Virtual Memory: 291.77 MB used, 134217728.00 MB total
LogD3D11RHI: Found D3D11 adapter 0: NVIDIA GeForce GTX 970 (Feature Level 11_0)
LogD3D11RHI: Adapter has 3906MB of dedicated video memory, 0MB of dedicated system memory, and 6076MB of shared system memory, 1 output[s]
LogD3D11RHI: Found D3D11 adapter 1: Intel(R) HD Graphics 4600 (Feature Level 11_0)
LogD3D11RHI: Adapter has 32MB of dedicated video memory, 0MB of dedicated system memory, and 1760MB of shared system memory, 0 output[s]
LogD3D11RHI: Found D3D11 adapter 2: Microsoft Basic Render Driver (Feature Level 11_0)
LogD3D11RHI: Adapter has 0MB of dedicated video memory, 0MB of dedicated system memory, and 256MB of shared system memory, 0 output[s]
LogD3D11RHI: Chosen D3D11 Adapter Id = 0
LogRHI: Texture pool is 1361 MB (70% of 1945 MB)
LogD3D11RHI: Async texture creation enabled
LogTextLocalizationManager: The requested culture ('de_AT') has no localization data; falling back to 'en' for localization and internationalization data.
LogContentStreaming: Texture pool size is 0.000000MB
LogTargetPlatformManager:Display: Building Assets For Windows
LogTargetPlatformManager:Display: Building Assets For Windows
LogDerivedDataCache:Display: Max Cache Size: 512 MB
LogDerivedDataCache: Loaded boot cache 0.03s 35MB C:/Users/BrainFooLong/AppData/Local/UnrealEngine/4.7/DerivedDataCache/Boot.ddc.
LogDerivedDataCache:Display: Loaded Boot cache: C:/Users/BrainFooLong/AppData/Local/UnrealEngine/4.7/DerivedDataCache/Boot.ddc
LogDerivedDataCache: FDerivedDataBackendGraph:  Pak pak cache file D:/TDMN/DerivedDataCache/DDC.ddp not found, will not use a pak cache.
LogDerivedDataCache: Unable to find inner node Pak for hierarchical cache Hierarchy.
LogDerivedDataCache:Display: Pak cache opened for reading ../../../Engine/DerivedDataCache/Compressed.ddp.
LogDerivedDataCache: Using Local data cache path C:/Users/BrainFooLong/AppData/Local/UnrealEngine/Common/DerivedDataCache: Writable
LogMeshUtilities: No automatic mesh reduction module available
LogMeshUtilities: No automatic mesh merging module available
LogInit: WinSock: version 1.1 (2.2), MaxSocks=32767, MaxUdp=65467
LogSlate:Warning: Failed to load font data from '../../../Engine/Content/Slate/Fonts/Roboto-Italic.ttf'
UdpMessaging: Initializing bridge on interface 0.0.0.0:0 to multicast group 230.0.0.1:6666.
SourceControl: Info Source control is disabled
SourceControl: Info Source control is disabled
SourceControl: Info Source control is disabled
LogSourceControl: RunCommandInternalRaw: 'git version'
LogSourceControl: RunCommandInternalRaw: ExecProcess ReturnCode=2 OutResults=''
SourceControl: Info Source control is disabled
LogObj: 24279 objects as part of root set at end of initial load.
LogUObjectAllocator: 5146200 out of 0 bytes used by permanent object pool.
LogEngine: Initializing Engine...
LogInit: XAudio2 using 'Lautsprecher (2- C-Media USB Headphone Set  )' : 2 channels at 44.1 kHz using 16 bits per sample (channel mask 0x3)
LogInit: FAudioDevice initialized.
LogAIModule: Creating AISystem for world NewWorld
LogDerivedDataCache: Saved boot cache 0.02s 35MB C:/Users/BrainFooLong/AppData/Local/UnrealEngine/4.7/DerivedDataCache/Boot.ddc.
LogInit: Texture streaming: Enabled
LogAnalytics: Creating configured Analytics provider AnalyticsET
LogAnalytics: ET APIKey = Rocket.Release. APIServer = http://et2.epicgames.com/ET2/. AppVersion = 4.7.0-2448202+++depot+UE4-Releases+4.7
LogAnalytics: ET APIKey = Rocket.Release. DataRouterUploadURL = https://datarouter-public-service-gamedev.ol.epicgames.net/datarouter/api/v1/public/data. AppVersion = 4.7.0-2448202+++depot+UE4-Releases+4.7
LogAnalytics: SetUserId 4f916d4a43ad77fb300ebd8f3c8d955f|18cff6de94764e17b0223dbb6ce423a5|0182a066-6076-4af0-b7d6-c313d796c6f5
LogAnalytics: AnalyticsET::StartSession [Rocket.Release]
LogInit: Transaction tracking system initialized
BlueprintLog: New page: Editor Load
LogAssetRegistry: FAssetRegistry took 0.0109 seconds to start up
LogDirectoryWatcher:Warning: Failed to begin reading directory changes for ../../../Engine/Plugins/Experimental/CharacterAI/Content/. Error: 0
LogTargetPlatformManager:Display: Building Assets For Windows
LogTargetPlatformManager:Display: Building Assets For Windows
LogSlate:Warning: Failed to load font data from '../../../Engine/Content/Editor/Slate/Fonts/Roboto-Regular.ttf'
LogSlate:Warning: Failed to load font data from '../../../Engine/Content/Editor/Slate/Fonts/Roboto-Bold.ttf'
LogCook:Display: Done creating registry. It took  0.00s.
SourceControl: Info Source control is disabled
Cmd: MAP LOAD FILE="D:/TDMN/Content/Maps/Editor.umap" TEMPLATE=0 SHOWPROGRESS=1 FEATURELEVEL=3
LightingResults: New page: Lighting Build
MapCheck: New page: Map Check
LightingResults: New page: Lighting Build
LogParticles: Destroying 0 GPU particle simulations for FXSystem 0x0000003C5D684EA0
LogBlueprint:Warning: USimpleConstructionScript::FixupRootNodeParentReferences() - Couldn't find inherited parent component 'Sphere1' for 'Ball' in BlueprintGeneratedClass 'REINST_BP_Ball_C_78' (it may have been removed)
LogEditorServer: Finished looking for orphan Actors (0.000 secs)
LogAIModule: Creating AISystem for world Editor
Cmd: MAP CHECKDEP
MapCheck: New page: Editor - Feb 22, 2015, 9:17:03 PM
MapCheck: Info Map check complete: 0 Error(s), 0 Warning(s), took 58.441ms to complete.
LogFileHelpers: Loading map 'Editor' took 2.248
LogCollectionManager: Loaded 0 collections in 0.001447 seconds
LogContentBrowser: Native class hierarchy populated in 0.0112 seconds. Added 1698 classes and 263 folders.
LogContentBrowser: Native class hierarchy updated for 'SceneOutliner' in 0.0024 seconds. Added 1 classes and 2 folders.
LogCrashTracker: Crashtracker disabled due to settings.
LogSlate:Warning: Failed to load font data from 'Veranda'
LogUObjectGlobals:Warning: Failed to find object 'Class None.'
LogLoad: Full Startup: 13.65 seconds (BP compile: 0.86 seconds)
LogContentBrowser:Verbose: The content browser source was changed by the sources view to '/Game/UI/Editor'
LogRenderer:Warning: Reallocating scene render targets to support 32x32 (Frame:2).
LogRenderer:Warning: Reallocating scene render targets to support 1528x936 (Frame:5).
LogAssetRegistry: Asset discovery search completed in 4.5722 seconds