Unreal Engine Issues

Assert When Saving Over Existing Level With Built Lighting

While saving over an existing map the engine will crash if both maps have baked lighting. ...

[CrashReport] UE4Editor_UMG!CastChecked<UUserWidget,UObject>

This is an early trending crash in the 4.17 release. This may be a regression as there is no initial evidence of this callstack occurring in 4.16. User DescriptionsJust compiled my widget Source C ...

Lightmass crash after finished building and hitting save

User is reporting that the editor will crash after lightmass has finished building and they click to save the project. ...

Crash in UEditorEngine::CheckForWorldGCLeaks

Error message: Fatal error: [Link Removed] [Line: 1959] /Game/FirstPersonBP/Maps/FirstPersonExampleMap.FirstPersonExampleMap still around trying to load ../../../Engine/Content/Maps/Templates/Templ ...

Crash when Building Lighting on Macs with Lighting Scenarios

A crash occurs when you building lighting with a project using Lighting Scenarios on a Mac. I attempted to reproduce the issue using a new blank project, but was unable to get the crash to occur. T ...

Crash when importing an Alembic file with Materials if it already exists

Editor crashes when using Save As

Editor crashes when using Save As Regression: Yes Broken: 3126145 (Dev-Core integration) Worked: 3126027 ...

[CrashReport] UE4Editor_UnrealEd!FLightmassExporter::SetVolumetricLightmapSettings()

This is a trending crash coming out of the 4.18 Previews. Users have not provided any description of their actions when the crash occurred. Source Context 1857 const FVector ImportanceExt ...

Setting spline in Niagara Override Parameters corrupts system after closing level

The USplineComponent appears to be corrupted. It will pass the null check, but operations done on the data cause the engine to crash. (See the linked UDN for more details) ...

Crash when changing "MaximumTextureSize" in "LeaveExistingMips" state

No problem with 4.22.3 ...