Unreal Engine Issues
Unreal Engine Issues
Cook Determinism - Construction Scripts and ChildActorComponent issues with DiffCooks
UE - Framework - Components - Jul 26, 2024To step through the issue, in the -DiffOnly cook add a breakpoint to UChildActorComponent::OnRegister and UChildActorComponent::OnUnregister. It should hit 4 times:Once when LoadPackage loads the ma ...
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 ...
Creating a copy of BSP after fliping it in geometry edit mode cause the copy to be invisible
UE - LD & Modeling - Modeling Tools - BSP - Aug 29, 2014Branch Build Label UE4-Main Promoted-CL- 2270796 DESCRIPTION: If a player goes into geometry edit mode and flips a bsp then makes a copy of it the copy will appear invisible ADDITIONAL NOTES: A ...
[CrashReport] Access violation in UE4Editor_Engine!FDistanceFieldAsyncQueue::ProcessAsyncTasks()
UE - Graphics Features - May 31, 2017This report has been logged due to a high volume of submitted crash reports. Additional information is currently unknown. User descriptionsDeleted 3 rocks from mesh folder and accepted to delete e ...
[CrashReport] UE4Editor_Engine!FDistanceFieldAsyncQueue::ProcessAsyncTasks() [distancefieldatlas.cpp:824]
UE - Graphics Features - Jul 20, 2017This is a common crash affecting users in 4.16. User Descriptionsremoving Inventory system form level.delete assets when was compiling shadersDeleting folderDeleting folder. Source Context 810 ...
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 ...