I’ve renamed one of my folders, clicked to fix up redirectors (someone advised to do it from time to time) - it detected one asset to delete, but it was ‘referenced’, so i canceled the window - and after that UE crashed. I just want to know if this is a ‘regular’ UE4 fault, or something is wrong with my (almost freshly created) project or asset. Seems like UE is VERY unstable when changing folder name/moving assets to another folders. Also, it often prevents from deleting an asset, because ‘it’s referenced’ - when it’s clearly NOT… So i must restart editor to be able to delete some asset. I really hope that 4.7 will bring some stability improvements, and further versions will give us more freedom from this ‘everything referenced’ hell 
MachineId:A7C3F0D1475F6BF6DA8AE980C167C7D3
EpicAccountId:
Unknown exception - code 00000001 (first/second chance not available)
Assertion failed: BlueprintActionDatabaseImpl::IsObjectValidForDatabase(AssetObject) [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.6\Engine\Source\Editor\BlueprintGraph\Private\BlueprintActionDatabase.cpp] [Line: 1131]
KERNELBASE + 37901 bytes
UE4Editor_Core + 3092349 bytes
UE4Editor_Core + 1597688 bytes
UE4Editor_Core + 1479058 bytes
UE4Editor_BlueprintGraph + 609033 bytes
UE4Editor_BlueprintGraph + 665469 bytes
UE4Editor_UnrealEd + 1807806 bytes
UE4Editor_UnrealEd + 1799927 bytes
UE4Editor_UnrealEd + 6686342 bytes
UE4Editor!FEngineLoop::Tick() + 3876 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launchengineloop.cpp:2214]
UE4Editor!GuardedMain() + 479 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launch.cpp:131]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]
Edit: After restarting editor, i was able to delete this redirector (not referenced anymore) with no crash.