Unreal Engine Issues
Unreal Engine Issues
Deadlock during cooking or editor in URigHierarchyController::AddElement on task thread while GarbageCollection occurs on gamethread.
UE - Anim - Runtime - Apr 15, 2026In URigHiearchyController::AddElement (and other functions), arbitrary delegate code is called while holding Hierarchy->ElementsLock, through the Notify function. URigHierarchy::AddReferencedObject ...
AnimNotify serialization crash in editor
UE - Anim - Runtime - Mar 15, 2026The crash is caused by changing the variable type of an AnimNotify that is already referenced by a montage. This issue cannot be reproduced in 5.6. ...
Frame-locked sequencer intermittently triggers notify state end event
UE - Anim - Runtime - Mar 10, 2026Frame-locked Sequencers can occasionally produce frames with a zero delta time due to frame number truncation. When this occurs, if the animation cursor is within the range of a Notify State that is ...
Clicking on the timeline to move the playhead of the Persona animation viewer does not move the playhead.
UE - Anim - Runtime - Mar 6, 2026Scrubbing is the only way to move the playhead. ...
anim notify states are triggered when updating thumbnails
UE - Anim - Runtime - Feb 19, 2026The issue is that FAnimationSequenceThumbnailScene::SetAnimation calls referesh bone transforms which will trigger notify states present at the midpoint of the animation (as the thumbnail code sets ...
Missing logging or error when applying an anim instance to a skeleton that the anim instance doesn't match.
UE - Anim - Runtime - Feb 9, 2026Currently, we detect whether an anim instance is supported by the skeletal mesh and, if it isn't, unreference the instance, but we don't error or warn the user that this happened. This leads to conf ...
Crash at Skeleton Remapping
UE - Anim - Runtime - Nov 14, 2025The details are in the EPS : [Link Removed] ...
Curve Debugger window is broken when viewing curves in the Anim Sequence editor
UE - Anim - Runtime - Oct 15, 2025The curve debugger is currently broken when viewing curves on anim sequences. It seems that only metadata/skeleton curves are displayed, and those aren't updating correctly or showing their type (m ...
[Interchange] FBX - Front Facing X-Axis and Flipped Bone Orientation During Animation
UE - Anim - Runtime - Oct 15, 2025Actors attached to a skeleton imported through a FBX file with the Front Facing X-Axis option enabled are flipped when the skeleton is animated. ...
Move SAnimTimeline, SAnimTrackArea, and SAnimTrack to public API
UE - Anim - Runtime - Sep 14, 2025I wanted to be able to make use of the same widgets the AnimSequence uses for its timeline with play/pause, rewind, etc. However I discovered this was all in private folders in the Persona plugin. ...