Unreal Engine Issues
Unreal Engine Issues
Alembic Geometry Cache crash with multiple meshes
OLD - Anim - Sep 1, 2016Importing an Alembic geometry cache will cause a crash with multiple assets. Test asset attached that can reproduce this. When I tried with a couple of simple shapes from 3Ds Max I did not get the ...
ACineCameraAttachMount's "Target Actor" constraint does not work with Spawnables or Replaceables in Sequencer
UE - Virtual Production - Tools - Virtual Camera - Aug 12, 2025Constraints (UTickableConstraint) are usually created throuh the "Animation" tab available in the Editor's "Animation Mode". When created through that interface while Sequencer is open, the internal ...
Crash: Nativized AnimBP instances can assert on load in a cooked build with async loading enabled.
UE - Gameplay - Blueprint - May 9, 2019This is a regression that was introduced alongside a memory optimization for Animation Blueprint assets. Suggested workarounds:Disable "Async Loading Thread Enabled" ORDisable Blueprint nativizati ...
MetalRHI Asserts When Using "Profile GPU" With RHI-Thread/Parallel-Execution
UE - Graphics Features - Sep 14, 2016When the RHI thread is enabled (with or without parallel-execution) for Metal it isn't currently possible to run "profilegpu" because the GPU timestamp emulation code isn't multi-thread safe and pro ...
Crash in FVulkanLinuxPlatform
UE - Platform - Linux - Apr 17, 2019Using the command in the repro steps on Linux will cause the Editor to crash and CrashReporter to pop up with a callstack. This behaves differently when tried on Windows with -vulkan. The project ...
EQS Overlap test no longer recognizes custom Collision Object Channel
UE - AI - Nov 12, 2019Environment Queries Ignore tests for Custom Collision Object Overlaps. Note: The expected behavior seems to have worked in 4.21, After following the steps to reproduce, I can verify a successful de ...
Certain UPROPERTY values are not updated during auto-recompile
UE - Gameplay - Blueprint - Aug 4, 2016Sometimes manual recompile is required to make a blueprint actually recompile data-only changes, but not always. If the last manual compile was with default values, then changes are not updated. If ...
[CrashReport] UE4Editor_SlateCore!SWidget::ExecuteActiveTimers() [swidget.cpp:986]
UE - Rendering Architecture - Materials - Dec 15, 2017User comments:right mouse button in material editor made engine crash....becomes slow and crash....64gb ram, 2 xeon and gtx690....need to restart computer to everything works fine. need a solution t ...
Crash on exit PIE when playing with more than one player on Linux
UE - Platform - Linux - Oct 3, 2016When playing in non-single player game in the editor (either set # players or check dedicated server checkbox), the editor will crash when the play session ends. Regression: Yes - editor does not c ...
Duplicating a map crashes the editor (Blueprint compile crash)
UE - Gameplay - Blueprint - Jan 5, 2015EDIT: Date: 1/21/2015 Adding the [Link Removed] Duplicating a map in the Content Browser crashes the editor. It does not matter if the map being duplicated is the currently open map or not. EDIT ...