Unreal Engine Issues
Unreal Engine Issues
Destroying a welded actor is causing an Array index out of bounds crash on 5.6
UE - Simulation - Physics - Jul 30, 2025Destroying a welded actor is causing an Array index out of bounds crash on 5.6. The licensee has provided a repro project that reliably causes a crash whenever the spawned actor is destroyed. There ...
[CrashReport]UnrealEditor-DatasmithImporter!FDatasmithImporterHelper::ImportInternal(UFactory *) [DatasmithImporterHelper.cpp:218]
UE - Editor - Content Pipeline - Datasmith - Jul 18, 2022Generated from CrashReporter ...
HLOD Build crashing when building nanite for mesh with 2 material having the same parameters
UE - World Creation - Worldbuilding Tools - HLOD - Dec 2, 2023From Licensee: Catching the exception with debugger allowed us to find a list of materials on the hlod mesh on which the error occured and we were then able to link it to one of our meshes causing ...
Crash in reinstancing after removing a variable from a component and compiling
UE - Gameplay - Blueprint Compiler - Jun 6, 2023Adding a new macro to a Blueprint Macro Library after renaming the first macro causes a crash
UE - Gameplay - Blueprint - Mar 17, 2022It seems the editor crashes when adding a new Macro to a Blueprint Macro Library. This only occurs if you rename the macro that gets automatically created when you open the macro library to somethin ...
Crash after 'Reparent Blueprint' when renaming component on-top of orphaned inherited component
UE - Framework - Blueprint Editor - May 7, 2024After reparenting a blueprint and inherited components from the previous parent are removed, trying to give a new component the same name as a previous component causes a crash inside UObject::Renam ...
FLiveCodingModule::StartLiveCoding() unsafe access of FModuleManager::Get().OnModulesChanged()
UE - Foundation - Cpp Tools - Live Coding - Dec 19, 2023A user has reported a failing ensure in FMRSWRecursiveAccessDetector::AcquireWriteAccess(), a race condition that has a small chance of happening when launching the editor. FLiveCodingModule::Start ...
GeometryScript_TextureUtils.sample_texture2d_at_uv_positions in python
UE - Graphics Tools - Modeling Tools - GeometryScripting - Nov 17, 2022Licensee- "GeometryScript_TextureUtils.sample_texture2d_at_uv_positions does not work in python. The uvlist becomes nullptr from python to C++. BP is working fine." ...
Build All Levels fails with duplicate level instances
UE - World Creation - Worldbuilding Tools - Level Instances - Jan 24, 2024iPadOS AR App Crashes when ARKit's "Use Scene Depth for Occlusion" is Enabled
UE - Platform - XR - Dec 13, 2024Does not crash in 5.4 on same hardware so looks like a regression. Attached Unreal logs indicate source of critical error: 'FARKitCameraOverlayMobilePS' shader uniform expression set mismatched sh ...