Unreal Engine Issues
Unreal Engine Issues
Montage Root Motion does not work from sub anim instances
UE - Anim - Gameplay - Oct 25, 2019Root motion from sub instances is not used when the parent instance is marked as 'Root Motion from Montages Only'. Proposed fix is to modify USkeletalMeshComponent::IsPlayingNetworkedRootMotionMo ...
ISM Component in an instanced BP does not take into account changes to NumCustomDataFloats from the BP class
UE - Graphics Features - Sep 16, 2022PerInstanceSMCustomData is bulk serialized and doesn't get changed on the BP instance when changing NumCustomDataFloats, possibly causing out of bounds array access leading to a crash. Possible sol ...
LOD ScreenSize per platform is not reflected in the mobile preview
UE - Platform - Mobile - Jan 31, 2023in 5.0 or 5.1, MinimumLOD per platform can be previewed in the mobile ES3.1 preview mode, but It seems that the LOD ScreenSize per platform is not reflected in the mobile preview. ...
DX12/SM6 Sampler Counts increased for empty materials between 5.1 and 5.2
UE - Rendering Architecture - Materials - May 19, 2023While not a major issue in and of itself, this can cause considerable headaches for materials where sampler counts in 5.1 were at 15/16 or 16/16 and when upgrading to 5.2 are now exceeding the built ...
Performance hitch from RemoveGeometryCache flushing the render thread
UE - Editor - Content Pipeline - Alembic - Jun 12, 2025FGeometryCacheStreamingManager::RemoveGeometryCache calls FlushRenderingCommands which shows up as a hitch when profiling. [Link Removed] Ideally the flush added in CL#23782411 to fix a rare deadl ...
[CrashReport] UE4Editor_Kismet!SBlueprintPaletteItem::OnNameTextCommitted() [sblueprintpalette.cpp:1319]
UE - Gameplay - Blueprint - Sep 28, 2017This is a trending crash after the 4.17.2 hotfix, although it has existed since the 4.16.1 hotfix. User Descriptionswas creating a new graph in a blueprint ...
FFieldPath resolution doesn't handle redirection
UE - CoreTech - Feb 16, 2022A licensee has found that redirectors don't apply to FFieldPath. We should integrate it with the following changes:It needs better error handling (looks like it could infinitely recurse),The change ...
PN Tessellation and Grass Node Crash Engine
UE - LD & Modeling - Terrain - Landscape - May 14, 2015Landscape Materials which use the new Grass Output and have Tessellation turned to PNTriangles will crash the engine Also reproduced in Main Promotable-CL-2550487 & Releases/4.8/Promoted-CL-255045 ...
[CrashReporter] UE4Editor-PropertyEditor!FPropertyNode::GetDiffersFromDefaultForObject(FPropertyItemValueDataTrackerSlate &,UProperty *) [PropertyNode.cpp:1634]
UE - LD & Modeling - Terrain - Landscape - Sep 13, 2019Generated from CrashReporter ErrorMessage: Unhandled exception Callstack similar to [Link Removed] comments from community: Clicked on a procedural grass node in the Brushify material This ...
Crash when using Crtl+Z after wrapping and selecting padding field
UE - Editor - UI Systems - Feb 22, 2017Editor crashes when clicking in to a padding field after wrapping a widget and then trying to undo the change. ...