Unreal Engine Issues
Unreal Engine Issues
Insufficient precision of Decode71 function
UE - Rendering - Architecture - Shaders - Jun 5, 2025Encode71 and Decode71 in DeferredShadingCommon.ush are functions that convert 8-bit values to 7-bit values and mask values, and licensees have reported that the accuracy is insufficient when usi ...
Nativized BP Struct dependency can lead to a fatal loader stall
UE - Gameplay - Blueprint Runtime - Mar 7, 2018Report of a chain of dependencies that can lead to a fatal loader stall in a nativized build:Thing -> BPStruct2BPStruct1 -> BPStruct2 The necessary order of operations is:BPStruct1 loadsBPStruct2 l ...
Incorrect level sequence playback in replay with sequence start time != 0
UE - Networking - Jan 16, 2020"Our dynamic duplicate in-memory replays broke when an artist put an ULevelSequencePlayer in one of the dynamic source level levels. The UMovieSceneSequencePlayer base class has PostNetReceive call ...
Geometry collection - source geometry not updating and reset bug
UE - Runtime - Simulation - Aug 17, 2023This issue was reported by a customer trying to modify the static meshes of a GeometryCollection. After removing some meshes from the Geometry Source, he used the Reset button to apply the changes t ...
Motion Warping component disappears on Editor restart or when swapping engine versions.
UE - Anim - Gameplay - Nov 19, 2024Motion Warping component is disappearing on Editor restart or when swapping engine versions. When this occurs, the BP has the following Compiler Results messages: Component class is not set for'Mot ...
Section::TrimSection resulting in bad key values at start and end of trim range
UE - Anim - Sequencer - Dec 17, 2025The trim process inserts keys at the start or end of the range depending if you specify Trim Left or Right, I'm finding that Trim right is inserting a key at the end of the section that is incorrect ...
Property editing of FName properties doesn't restrict their length
Tools - Apr 29, 2015We likely have several places in the editor that convert text taken from an editable text into an FName without ensuring that the string will fit into an FName. This can lead to editor crashes. One ...
[CrashReport] FLandscapeEditorCustomNodeBuilder_TargetLayers::OnTargetLayerDeleteClicked()
UE - LD & Modeling - Terrain - Landscape - Oct 5, 2017This is a somewhat common Landscape crash occurring throughout the 4.17 release. User Descriptions1) rename landscape layer, 2) delete layer in landscape tool Source Context 1307 FReply FL ...
Navmesh doesn't work in a Packaged Build if it was placed in a Sublevel
UE - AI - Oct 19, 2018Once packaged, a persistent level is unable to create navmesh data properly if the navmesh bounds volumes are only present in its sublevels. The issue can be traced to the UNavigationSystemV1::IsThe ...
If use Remove Unused Bones from Skeleton, PoseAsset of the skeleton will be broken
UE - Anim - Runtime - Jul 10, 2019If user execute "Remove Unused Bones from Skeleton" on Skeleton where PoseAsset exists, the index held in FPoseData :: TrackToBufferIndex in PoseAsset will not be corrected, and it will refer to the ...