Unreal Engine Issues
Unreal Engine Issues
Editor crash when using PCG self pruning and complex collision
UE - World Creation - Procedural Tools - PCG Workflow - May 14, 2025While testing out pruning points based on collision, it was observed by the licensee that using complex collision seems to crash the editor. The editor crashes with the following error: ``` Asserti ...
[Interchange] Crash on asset re-import
UE - Editor - Content Pipeline - Import and Export - Feb 7, 2025We've started seeing a crash in editor when re-importing one of our assets. <pre class="ql-syntax">Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 783] Array index out of ...
If pasting a section causes an overlap, don't allow it if the track doesn't allow overlapping sections
UE - Anim - Sequencer - Nov 4, 2024Binding lifetime sections aren't meant to overlap, but duplicating one, or pasting one can cause them to overlap, triggering an ensure. Duplication and copying and pasting are typical actions, so th ...
LevelSequence Editor consumes input, even if the user last focused the Level Viewport
UE - Anim - Sequencer - Nov 27, 2024LevelSequenceEditor has input priority over the Level viewport and other editor modules even though the Level viewport has been the last one selected. An example would be a cut operation. If you ha ...
ChaosCacheManager is not reproducing Trailing Events
UE - Simulation - Core - Mar 28, 2025ChaosCacheManager (CCM) is not reproducing Trailing Events. Particles set to track Trailing Events correctly follow the position of the trailing event when the Geometry Collection (GC) is physically ...
ChaosCacheManager is not reproducing Collision Events the second time you Record and Play
UE - Simulation - Core - Mar 28, 2025ChaosCacheManager (CCM) is not reproducing Collision events the second time (and onwards) we record a Geometry Collection (GC) breaking session. Particles set to track Collision Events correctly fol ...
[CrashReport] UE4Editor_LevelEditor!SLevelViewport::BindShowCommands() [slevelviewport.cpp:1429]
Tools - Nov 10, 2017This is a longstanding but infrequent crash that has occurred since at least 4.16.1. Users have not provided any descriptions of their actions when the crash occurred. The callstack closely matche ...
Auto Reimport crash with some file paths
UE - Editor - Content Pipeline - Import and Export - Dec 14, 2016Auto Reimport source paths can cause a crash with the editor. I couldn't narrow down in my limited testing what would cause the crash vs what would not with these file paths. The one in my attached ...
[Soundfield Submix][Crash] - Unreal Ambisonics Crashes on Packaged Game and in Standalone
UE - Audio - Submixes - Jan 11, 2021Issue was reported by a user on the Unreal Engine forms. I tried to package the game with the other encoding options and this appears specific to using the Unreal Ambisonics option. I have only co ...
Out-of-Bounds Access During Partial Updates of ISMC Per-Instance Custom Data
UE - Graphics Features - Jan 6, 2026When using instance custom data values, removing an instance and changing the number of custom data floats in sequence can cause an array-out-of-bounds crash. The underlying arrays are not resized ...