Unreal Engine Issues
Unreal Engine Issues
Level Instance Editor Paths not resolving correctly
UE - World Creation - Worldbuilding Tools - Level Instances - Jun 25, 2024Soft refs to actors within level instances are not working for:Level Script.BP assets dynamically spawned at runtime.Placed BPs may also have their soft ref broken (maybe this issue is more-so relat ...
4.23 Preview crashes with command line arguement -AutomatedMapBuildUseSCC = False
UE - Foundation - Core - Aug 1, 2019Using an automated script in command line arguments to build project map causes a crash. Note: that it will not crash when 'UseSCC=false' is omitted, but it will not build the map either. Screen gr ...
Creating FTickableObjectBase inherited class in async thread may cause pure virtual function call
UE - Framework - May 22, 2025Classes that inherit from FTickableObjectBase are added to the tickable queue by the QueueTickableObjectForAdd function during their construction (see FTickableGameObject::FTickableGameObject). At t ...
HTML5 shows up as black screen in FireFox 32-bit
UE - Platform - Mobile - Apr 16, 2015Packaged HTML5 games are not running on FireFox 32-bit Version 37.0.1; Some projects will also provide you with a scripting error that appears when you attempt to run the game on 37.0.1 Spoke with ...
Open Sound Control Blueprint Plugin stops working around 1 minute during play
UE - Audio - Jun 3, 2020Messages are not received around 1 minute into playing when using OSC blueprint plugin. Test Project: [Link Removed] User workaround: https://forums.unrealengine.com/development-discussion/blu ...
[Quartz] Play Quantized Crashes When Played On An Audio Component Spawned With 'Persist Across Level Transition'
UE - Audio - Quartz - Jul 15, 2022There's a crash when "Play Quantized" is used on an Audio Component that was constructed via the functions "Create Sound 2D" or "Spawn Sound 2D" when the option 'Persist Across Level Transitions' is ...
Niagara Remove Pin Feature now deletes the variable completely from the Parameters Pane
UE - Niagara - Mar 12, 2020This is a regression from 4.24.3 (CL-11590370). Removing a pin on a Niagara Module Script parameter will removed the variable as well. This was reported and tested in 4.25 Preview 2 (CL-12055273) ...
Crash when using automated groom import
UE - Editor - Content Pipeline - Import and Export - Jan 5, 2021UDN customer reported that using automated groom import through Blueprint was crashing. This can probably be reproduced with a Python script using an asset import task with the automated flag set to ...
When ControlRig.EnableAnimNodePerformanceOptimizations is enabled, the default pose briefly appears after the Control Rig is reinitialized
UE - Anim - Rigging - Control Rig - Sep 1, 2025Since UE5.6, ControlRig.EnableAnimNodePerformanceOptimizations is enabled by default, and this appears to be causing the issue. Specifically, when the control rig’s construction event is processed, ...
Player/Visibility Collision Doesn't Work with InstancedStaticMesh
UE - Simulation - Physics - Jul 24, 2018Player/Visibility Collision doesn't work with InstancedStaticMesh or HierarchiInstancedStaticMesh components. Found in 4.19 CL# 4033788, 4.20 CL# 4212847, 4.21 CL# 4221482 ...