Unreal Engine Issues
Unreal Engine Issues
DynamicEntryBox with EntryBoxType Radial is stacking Entries if SectorCentralAngle is multiple of 360.0f and DistributeItemsEvenly is enabled
UE - AI Workflows - UI Systems - May 27, 2025DynamicEntryBox with EntryBoxType Radial is stacking Entries if SectorCentralAngle is multiple of 360.0f and DistributeItemsEvenly is enabled. The licensee has provided an analysis: On void SRadia ...
FMultiReaderSingleWriterGT isn't thread safe
UE - Foundation - Core - May 17, 2016From https://udn.unrealengine.com/questions/292741/fmultireadersinglewritergt-isnt-thread-safe.html: I've found that FMultiReaderSingleWriterGT has at least 2 bugs: The one that caused a deadlock ...
Warning Failed to find object 'Class None.NewBlueprint' appears on any selection ChildActor Component in BlueprintEditor
UE - Framework - Blueprint Editor - Dec 14, 2021Summary: The following warning appears on each selection of any ChildActorComponent inside Blueprint Editor:LogUObjectGlobals: Warning: Failed to find object 'Class None.NewBlueprint1' (where NewBl ...
Sub Animation Blueprint causes crash when compiling character BP
OLD - Anim - Dec 9, 2016Error message: Access violation - code c0000005 (first/second chance not available) Source Context: 931 OutputCurveMap(AnimationCurves[(uint8)EAnimCurveType::AttributeCurve], Canvas, Displa ...
Lags in animation when set leader pose component is used
UE - Rendering - Architecture - Aug 2, 2023https://udn.unrealengine.com/s/question/0D54z00009UJv5HCAT/lags-in-animation-when-set-leader-pose-component-is-used From licensee: "USkinnedMeshComponents have the option to double-buffer their bo ...
Montage Editor calls NotifyEnds of AnimNotifyState even when paused
UE - Runtime - Animation - Oct 13, 2023In the Animation Montage Editor, NotifyEnd is unexpectedly called when a time marker is in the middle of an AnimNotifyState and the animation preview gets paused. Because the Animation Montage Edito ...
Launching multiple Editor processes in UE 5.5 can throw warnings due to USD Core plugin initialization
UE - Editor - Content Pipeline - USD - Apr 23, 2025Launching multiple Editor processes at the same time with the USD Core plugin enabled can cause warnings to be logged like the following:LogUsd: Warning: Failed to update LibraryPath for USD plugInf ...
BlendSpace Loop Boundary Produces Inconsistent Sync Marker Data andTriggers an AnimSequence Follower Assertion
UE - Runtime - Animation - Jul 22, 2026Summary In UE 5.7.4, when a looping BlendSpace with Match Sync Phases enabled plays as a SyncGroup Leader and crosses its loop boundary during a transition to an external AnimSequenceFollower in th ...
[CrashReport] UE4Editor_Engine!FAnimCurveBase::SetCurveTypeFlag() [animcurvetypes.cpp:18]
OLD - Anim - Jun 13, 2016This Jira was created from CrashReports submitted by the public due to the high number of occurrences. Descriptions from users are provided below. Error message: Access violation - code c0000005 ( ...
Target Rotation of Physics Handle doesn't register and can't be manipulated on tick
UE - Gameplay - May 26, 2016Target Rotation of Physics Handle doesn't register and can't be manipulated on tick User Description: I mentioned some versions before that rotation of Physics Handles is broken and now it is even ...