Unreal Engine Issues
Unreal Engine Issues
Rare crash in FWidgetAnimationState::OnStopped
zComponent - Archive - Jun 22, 2026The FWidgetAnimationState::OnStopped delegate is getting created when the widget anim state is being destroyed and then queued to be executed later. Something is happening between the queue and the ...
Backout attempted fix for - AutoSize triggers ensure on shortened Skel Anim Section moved past anim length
zComponent - Archive - May 29, 2026In Sequencer, calling "Edit > Auto Size" on a UMovieSceneSkeletalAnimationSection triggers the LowerBound > UpperBound ensure in UMovieSceneSection::SetRange (MovieSceneSection.h:333) when the secti ...
Sequencer: Expansion State of Animation Track Properties is not saved
zComponent - Archive - May 26, 2026The expansion state of Animation Track properties is only saved when Section > Advanced is expanded or collapsed.` ...
AutoSize triggers ensure on shortened Skel Anim Section moved past anim length
zComponent - Archive - May 26, 2026In Sequencer, calling "Edit > Auto Size" on a UMovieSceneSkeletalAnimationSection triggers the LowerBound > UpperBound ensure in UMovieSceneSection::SetRange (MovieSceneSection.h:333) when the secti ...
Visibility track key value is no longer the inversion of the bound bHidden property
zComponent - Archive - May 13, 2026Regression introduced in UE 5.7. Works correctly in UE 5.6. Up to UE 5.6, the bool value written to the Visibility track's BoolCurve was the inversion of the underlying bound property (e.g. AActor: ...
USD Stage - Import loses UV on a skeletalmesh with animation
zComponent - Archive - Apr 28, 2026https://forums.unrealengine.com/t/usd-import-issue-when-trying-to-import-skeleton-with-animation/2718449 I put another png has the user forgot to add theirs. ...
Spot Light USD Export Produces Incorrect Intensity Values Based on Cone Angle and Source Radius
zComponent - Archive - Apr 3, 2026UPDATE: Should be fixed as of CL#52537078 (fb7af1) USD: Bake all frames of exposure animation tracks. When exporting Unreal Engine spot lights from a level to USD, lights with identical EV intensit ...
Control Rig + Animation in Sequencer Can Lead to Unexpected Slider Reset
zComponent - Archive - Mar 30, 2026When a character has both a Control Rig track and an Animation track, interacting with any slider in Sequencer can be interrupted. ...
"Allow Sequencer Edits Only" and Control Rig performance impact
zComponent - Archive - Mar 27, 2026We noticed an issue working in sequencer with "Allow Seqeuncer Edits Only" and control rigs. Performance will drop when manipulating using the AnimDetails channel sliders. ...
USD Export - crashes when sub level holds level instance
zComponent - Archive - Mar 27, 2026The engine is crashing when the user tries to export from a persistent level with a sub level that contains a level instance. ...