Unreal Engine Issues
Unreal Engine Issues
Deadlock in UAnimationSequencerDataModel::Evaluate where FScopeLock Lock(&EvaluationLock) blocks execution indefinitely
UE - Anim - Nov 4, 2025When both the Sequencer Editor and an Animation Curve Editor are open for the same animation asset, the editor freezes completely upon editing the curve. Analysis indicates that the freeze is caus ...
Client Gameplay Effect stuck on due to duplicate ReplicationIDs
UE - Gameplay - Gameplay Ability System - Oct 31, 2025We've been tracking down a problem recently with the Gameplay Ability System where a gameplay effect is properly removed on the server, but the client has the gameplay effect stuck on permanently. ...
Point Lights Invlidate Virtual Shadow Map Cache when at a distance from attenuation radius
UE - Rendering - Graphics Features - Oct 28, 2025When the camera is outside of a certain distance from a point lights attenuation radius the VSM of that point light stops caching shadow maps. This can also be reflected in the output from the 'r.S ...
Uploading of the SBT via copy queue is not guaranteed to be synced with async compute queue but only direct queue in d3d12
UE - Rendering - Graphics Features - Ray Tracing - Oct 28, 2025When HitLighting is enabled, SBT commit is running on the Graphic Queue, and the pass "LumenSceneLighting->offscreenshadows->LumenDirectLightingHardwareRayTracingRGS" that uses SBT could run on the ...
World Partition view has different orientation compared to top-down orthographic view
UE - World Creation - Worldbuilding Tools - World Partition - Oct 27, 2025Orthographic viewport orientations were re-worked as part of the effort to align UE's editing experience with other industry-standard DCC tools. The World Partition view is still using the legacy o ...
bStaticWhenNotMoveable in Lighting category instead of Physics
UE - Runtime - Character - Oct 24, 2025"UPrimitiveComponent::bStaticWhenNotMoveable"'s category is set to Lighting, not Physics. This causes it to be hidden when lighting-related properties are hidden, even though it controls physics sta ...
Mover character no longer calls ProduceInput on server when the only client unpossesses it and disconnects
UE - Gameplay - Player Movement - Mover - Oct 21, 2025When a client disconnects/unpossesses a mover character, the character's Network Prediction Component will re-configure itself now that it does not have a net connection. However, this handling will ...
Body Setup of a Static Mesh with Simple Collision will pass validation, but removing it and using only a Complex collision and setting Collision Complexity "Use Complex as Simple" will fail validation: "Bone None requires at least one collision shape".
UE - Runtime - Character - Oct 20, 2025Context: By default, Unreal Engine creates both simple and complex shapes, then, based on what the user wants (complex query versus simple query), the physics solver will use the corresponding shape ...
[Interchange] FBX - Front Facing X-Axis and Flipped Bone Orientation During Animation
UE - Runtime - Animation - 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. ...
Intermittent Content is Missing from Cook errors for objects with Niagara packages
UE - Niagara - Oct 15, 2025Intermittently when cooking large licensee projects, an error is reported at the end of the cook:LogCook: Error: Content is missing from cook. Source package referenced an object in target package b ...