Unreal Engine Issues
Unreal Engine Issues
Chaos Mover crash in standalone editor client
UE - Runtime - Character - Aug 18, 2026When using the Chaos Mover with resimulation enabled, standalone editor processes running as a client will crash around 80% of the time upon startup. ...
Crash in FMovieSceneNumericVariant::Set when loading a Level Sequence with Custom Time Warp on Android
UE - ACT Character - Sequencer - Aug 14, 2026On Android, loading a Level Sequence fatals in the async loading thread: Assertion failed: (NewValue & ~PAYLOAD_Bits) == 0 MovieSceneNumericVariant.cpp:133 Unable to store a pointer outside of a ...
Baking FK Control Rig with Spawnable Manny in sub sequence is not working
UE - ACT Character - Anim in Engine - Aug 14, 2026FK Control Rig bake is not working on Manny, both as a SKM actor or a BP Actor with a SKM component in it. This is only happening when the actors are Spawnable and nested inside a master sequence. I ...
Virtual Texture Collection doesn't show correct mip level
UE - Rendering - Architecture - Jul 30, 2026Textures from VirtualTextureCollections appear blurry because the correct mip level isn’t shown unless FVirtualTextureCollectionResource::InitRHI is modified in VirtualTextureCollection.cpp withProd ...
MovieSceneSequencePlayer GetEndTime() reports incorrect end time
UE - ACT Character - Sequencer - Jul 28, 2026We've noticed an inconsistency with UMovieSceneSequencePlayer::GetEndTime(). It does not take into account DurationSubFrames. See UMovieSceneSequencePlayer::GetDuration() for comparison. Also, the c ...
Crash when merging Skeletal Mesh with incomplete LOD streaming
UE - Runtime - Deformable - Jul 24, 2026SummaryMerging a Skeletal Mesh whose LOD streaming has not completed crashes with an AccessViolation while the vertex copy reads the Null buffers of LODs that have not been streamed inRoot cause is ...
Overwriting an anim sequence may scale the play rate of the anim instead of modifying underlying frame rate
UE - ACT Character - Anim in Engine - Jul 21, 2026The frame rate for an anim sequence is not being changed as expected when its being overwritten / re-imported. ...
Regarding TObjectPtr performance regression
UE - Core - Systems - Jul 13, 2026This is from the linked EPS case: ============================== When 5.0 first introduced TObjectPtr, the guidance was that it would compile down to raw pointer access in Shipping builds to ensu ...
Memory leak with -renderoffscreen and uncapped frame rate
UE - Rendering - RHI - Jun 22, 2026A customer reported that -renderoffscreen leaks when running with an uncapped frame rate ...
Sequencer - if you set the Take Separator to - rather than _ the New Take naming will mess up
UE - ACT Character - Sequencer - Jun 9, 2026When using a non-default take separator (eg "-") the "New Take" option produces a malformed proposed name for the take. ...