Unreal Engine Issues
Unreal Engine Issues
Different Number of Frames imported from the same FBX between UE 4.8 and 4.9
OLD - Anim - Sep 14, 2015Using the same import settings in UE4.8 and UE4.9 will result in a different number of frames of an animation being imported from the same FBX file. If you import the same fbx animation which in M ...
Compatible skeletons not visible when "Show Only Compatible Skeletons" is Selected in Retarget Window
OLD - Anim - Aug 19, 2015When you right click on a Skeleton and select "Retarget to another Skeleton," in the subsequent "Select Skeleton" pop up Window, compatible skeletons are not visible when "Show Only Compatible Skele ...
[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 ...
Translucent Wireframe Materials Exhibit TSR Aliasing/Crawling Due To Incorrect Velocity Rendering When Set to Output Depth And Velocity
UE - Rendering - Graphics Features - Nov 27, 2025Note that this bug potentially also affects a wide variety of material / geometry setups; however, a translucent wireframe setup is currently the main reproduction case. The issue may also be notice ...
[CrashReport] UE4Editor_AlembicLibrary!AbcImporterUtilities::GenerateSmoothingGroupsIndices()
UE - Gameplay - Aug 5, 2016This JIRA is being entered as a result of it being one of the top crashes occurring in 4.13 Preview 1. Error message: Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 833] ...
Deprecated: CharacterMovementComponent::bRequestedMoveUseAcceleration
UE - Gameplay - Player Movement - May 3, 2019Licensee has brought into question the difference between NavMovementComp::bUseAccelerationForPaths Vs. CharacterMovementComponent::bRequestedMoveUseAcceleration. This led to a discussion in a Supp ...
Landscape BP Brushes in WP map causes changelist validation to fail
UE - Graphics Tools - Terrain - Landscape - May 13, 2022Using a Landscape BP brush in a WP map causes SCC validation to fail: [2022.05.13-09.04.47:880][473]SourceControl: Error: Changelist validation failed! [2022.05.13-09.04.47:881][473]SourceControl: ...
Material parameters flickering due to UMG animation switching and multi-threaded execution
UE - AI Workflows - UI Systems - UMG - May 12, 2026When continuously transitioning to UMG animations that have a track targeting the same material parameter within the UUserWidget::OnAnimationFinished event, the number of source inputs to UMovieScen ...
FKConvex::ElemCalcAABB ignoring current transform.
UE - Simulation - Physics - Apr 15, 2016FKConvexElem::CalcAABB was ignoring the elements currently defined transform, and only scaling. This means that any actor that has a transform (not just Merge Actors) could potentially have very dis ...