4.7.1 crash minimalization maximized window

Development Platform & Builds
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1

Hi,
I got crash whem maximized window is minimizing in the official 4.7.1, reproduction steps:

  1. download 4.7.1 official build
  2. create a sample project with some materials, in my case I created FPS sample with starter content
  3. open content browser
  4. press F11 to maximize main viewport
  5. open material editor, the material editor window will slide under the main viewport
  6. press F11 to minimize main viewport and observe the crash

Stack trace:

Assertion failed: IsValid() [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Runtime\Core\Public\Templates\SharedPointer.h] [Line: 658] 

KERNELBASE + 37901 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_LevelEditor!FLevelViewportLayout::MaximizeViewport() + 1275 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\leveleditor\private\levelviewportlayout.cpp:381]
UE4Editor_LevelEditor!FLevelViewportLayout::Tick() + 278 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\leveleditor\private\levelviewportlayout.cpp:685]
UE4Editor_UnrealEd!FTickableEditorObject::TickObjects() + 164 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\public\tickableeditorobject.h:15]
UE4Editor_UnrealEd!UEditorEngine::Tick() + 1635 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\editor.cpp:1110]
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]

Regards

Pierdek

2

Hello Pierdek,

I looked into your issue and was able to reproduce it locally. I have entered a Jira ticket at UE-11204 detailing the issue, and have brought it to the attention of the devs. I will be sure to keep you updated to changes as they are made.

I was able to find a workaround that might help with your workflow in the meantime. If you undock the material editor prior to pressing f11 to enter immersive mode I no longer experienced the crash. Hopefully this will allow you to continue working until a better solution becomes available. If this doesn’t work for you or there is anything else that we can help out with just let us know!

Thanks,