In texture settings windows, after changing Compression → Compression Settings to “BC7 (DX11, optional A)” the entire Unreal Editor closes without warning. The crash report window doesn’t show up.
How to reproduce:
In Project Settings → Project → Supported Platforms leave only Windows
In Project Settings → Platforms → Windows leave only DirectX11 (SM5)
Open a texture, change Compression → Compression Settings to “BC7 (DX11, optional A)”. The Editor should close after doing this.
I’ll also need you to verify if the crash happens on another Texture as well that is not one created for your project. You can do this by using the View Options in the Content Browser and then in the Engine Content folder you can locate a texture to change it’s compression settings. If this does not cause a crash, can you upload your texture that you’re having issues with. I’m not sure if this is a content issue, but it may be worth looking at as well.
I was able to see the crash happen in your project, and oddly the crash happen by just trying to open or right-click the texture file, but when I set the project back to use all platforms and support DX10, then re-launch the project I can open the file again. Then I can set it back to only Windows and DX11 and it will no longer crash. For some reasons I cannot get it to reproduce on my end unless I just leave it at the settings it was.
I’ve gone ahead and created JIRA UE-25224 for this. Hopefully something useful can be seen by the dev in the log and minidump files that can be useful to prevent this from happening.
Once there is any update to the ticket I’ll update here.