Unreal Engine Issues
Unreal Engine Issues
Unable to open UE4Editor on Linux - Bad hlslcc header found
UE - Platform - Linux - Nov 4, 2015UE4Editor does not open on Ubuntu 15.10 due to the following error: [2015.11.04-16.19.35:974][ 0]LogOpenGLShaderCompiler:Error: Bad hlslcc header found! Missing '#'!Error in `./UE4Editor': free(): ...
Renaming blueprint macro causes Failed import for EdGraph errors
UE - Gameplay - Blueprint - Feb 4, 2022Macro libraries try to support guid-based renaming: when a specific macro is renamed blueprints using the old name will automatically point to the new name and work properly. However, this fixup hap ...
Divergent group barriers in Lumen
UE - Graphics Features - Lumen - Apr 23, 2025Intel reported GPU crashes on their hardware caused by divergent group barriers in ScreenProbeConvertToIrradianceCS:[numthreads(THREADGROUP_SIZE, THREADGROUP_SIZE, 1)] void ScreenProbeConvertToIrra ...
Failed to generate Nanite data for mesh with bDoFastBuild enabled
UE - Graphics Features - Nanite - Oct 1, 2025If "bDoFastBuild" is enabled on a Static Mesh asset, in-editor it will never be able to have Nanite data built for it, preventing the Static Mesh from using Nanite. There is no way to fix this issu ...
Intermittant motion blur issues in content heavy scenes
UE - Rendering - RHI - Jul 30, 2026When using the following RHI/Render thread/GT sync configuration:r.OneFrameThreadLag 1r.GTSyncType 1 The previous skinning bone data can be corrupted and introduce visual artifacts on everything us ...
User Struct value set through a component is reset to default when modified through the level instance
UE - Gameplay - Jul 3, 2017Struct value set through a component is reset to default when modified through the level instance. If it's not set through the component, it works fine. User Description: There is a bug in the eng ...
[CrashReport] UE4Editor_Landscape!ULandscapeInfo::RecreateLandscapeInfo() [landscape.cpp:2128]
UE - LD & Modeling - Terrain - Landscape - Sep 28, 2017This is an early trending crash coming out of the 4.17.2 hotfix, with no record of occurring previously. The callstack is very similar to [Link Removed] (fixed in 4.17.2) and may be related. Users ...
Native gameplay tags in plugins are cleared when reading config files
UE - Gameplay - Aug 14, 2024When references to Gameplay Tags are loaded, it checks to see if they are already registered. If they are not already registered, it will notice it is invalid and may print a warning depending on th ...
[AI] The ZoneGraph show flag is in the ZoneGraphEditor module but used during runtime in ZoneGraph module
UE - Runtime - Character - Mar 18, 2025The show flag for ZoneGraph lives in the ZoneGraphEditor module, but it is used for debugging at runtime by the main ZoneGraph module. There are protections around the type of build and some for EDI ...
Crash Occurs when changing the 'Max Metal Shader Standard To Target' option within iOS Project Settings
UE - Platform - Mobile - Jan 26, 2017A crash occurs when setting the Max Metal Standard Shader version within the Project Settings for iOS. I tested on both Mac and PC and the crash occurs on both machines. Regression? No, this is not ...