4.12 unexpectedly crash

unreal editor suddenly crash when I’m editing level, there is no problem on my computer’s performance, when I checked in task manager all running normally

[link text][1]

Hi skinzart,

Can you provide more information about when this crash occurs so that we can try to reproduce it on our end?

Also, please provide as many of the following as possible:

  1. If the Crash Reporter window is present when the crash occurs, select “Copy Callstack to the Clipboard,” and paste that information in a document and add to this post. Be sure to hit “Submit” on the Crash Reporter pop-up to send the Crash Report to Epic.
  2. “UE4.log” Located: Engine\Saved\Logs\
  3. “ProjectName.log” Located: ProjectName\Saved\Logs\

Providing this information and appropriate logs will help us track down and isolate the source of the bug as quickly and efficiently as possible.

Thanks for your cooperation,



  1. im sory i don’t have debugging symbols to display the callstack
  2. this is the crash report file, project log file included. but i cant find the engine log [link text][1]

Thanks before

Your log is pointing to a hardware issue:

[2016.12.01-01.21.09:802][798]LogD3D11RHI: Timed out while waiting for GPU to catch up.

Error: Direct3DDeviceIMContext->Map(TempTexture2D,0,D3D11_MAP_READ,0,&LockedRect) failed 
 at D:\Build\++UE4+Release-4.12+Compile\Sync\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11RenderTarget.cpp:599 


Please make sure your drivers are up to date. You can also try deleting your DerivedDataCache folder from UE4’s install directory. If this doesn’t work try deleting your intermediate and saved folders from your Project folder and finally the Config folder.

Try these steps and let me know if they do not resolve your issue.