Ensure condition failed: Play an animation in the finished animation event called from UUserWidget::StopAllAnimation

Tools - UMG - Dec 1, 2020

If a widget has playing animation node in finished animation event, calling StopAllAnimations appends a new UMGSequncePlayer to ActiveSequencePlayers array during array iteration and cause ensure co ...

Meshs in a hidden sublevel may generate incorrect navmesh

Gameplay - AI - Nov 6, 2020

If the level has hidden sublevels, the regenerated navmesh result appears to have a hidden sublevel mesh placed at the origin. Apparently, the reason is that bNavigationRelevant is no longer consid ...

Datasmith Metadata returned as empty array on Python Import

Tools - Datasmith Importer - Oct 27, 2020

Metadata information seems to not be available on import. A user has reported that this was working before but I was able to reproduce the issue in //UE4/Release-4.24 cl 11590370 I am currently lis ...

Back-face culling not working when translucency is set to Ray Tracing

Rendering - Ray Tracing - Oct 23, 2020

While enabling Ray Tracing from the start of the project, when user sets GlobalPostProcess Translucency to Ray Tracing, the back-face of the plane is not culled. However, when the translucency is se ...

Localization working only in Standalone, Changes default language in Viewport

Tools - Localization - Oct 15, 2020

Localization is unintentionally changing UE default language to pt-BR when in viewport. This results in having to Stop, repeat steps, and select en to reset language to en. It does not change langua ...

Lighting channels not working as expected when enabling Ray Tracing Shadow

Rendering - Ray Tracing - Oct 13, 2020

Non-Ray Tracing Shadows are only cast from lights on meshes assigned to the same Lighting Channel. When enabling Ray Tracing Shadows this is not the case. Lights will still cast Ray Tracing Shadows ...

UBlueprintFileUtilsBPLibrary is inaccessible through Python script

Tools - Python - Oct 7, 2020

The BlueprintFileUtilsBPLibrary API is not accessible through python scripts run in the editor. Attempting to run a script utilizing BplueprintFileUtilsBPLibrary results in:LogPython: Error: Traceb ...

Crash when opening a project with Renderdoc plugin enabled while renderdoc is installed on the machine

Rendering - Oct 6, 2020

-The editor will crash when opening a project with the Renderdoc Plugin enabled while the user has Renderdoc installed on their machine. Uninstalling Renderdoc allows the project to open without cra ...

Crash when opening OculusVRDartsGame without oculus software installed

Online - OSS - Oculus - Oct 6, 2020

Several users have reported crashes when attempting to open the OculusVRDarts game we offer in our [Link Removed] Instead of allowing the engine to crash, we should handle this issue gracefully and ...