Unreal Engine Issues
Unreal Engine Issues
[AI] Editor crashes when editing values of an FInstancedStruct's TArray inside of a BP
UE - AI - Jun 30, 2023While using a custom struct that contains a TArray member variable with FInstancedStruct, you cannot edit it in the editor without a crash. Other structs and types work as expected even if they deri ...
Build fails due to potential divide by 0 error
UE - Graphics Features - Sep 29, 2017Shipping builds of the Engine fail when using the Visual Studio 2017 compiler due to a potential divide by 0 error. This is because the TotalColumnSize property of SMemoryStats is set to 0 by defaul ...
BuildId in the UE4Editor.version file for a local binary build will sometimes be updated when a hot reload is performed
UE - Foundation - Core - Feb 10, 2018Performing a hot reload on a project that is using a local binary build of the Engine will sometimes result in the Engine's UE4Editor.version file being updated with a new BuildId value. That result ...
NPC - Texture Sample DI does not work on Niagara Parameter Collections
UE - Niagara - Nov 8, 2023Texture sample DIs no longer work when used with Niagara Parameter Collections. This seems to affect Volume Texture DIs based on customer reports, but I have not confirmed this. ...
LevelStreamingPersistence: BP added components don't persist properties in PIE until map actor resave
UE - World Creation - Worldbuilding Tools - Mar 6, 2026Context The LevelStreamingPersistence plugin can be used to remember and restore properties on actors, components and other objects that are part of a streamed level. Persisted properties are resto ...
Linux server builds of 4.24.0 failing due to Text3D plugin's dependencies on FreeType2 and HarfBuzz
UE - Platform - Linux - Jan 31, 2020The build error is descriptive. FreeType2.Build.cs and HarfBuzz.Build.cs explicitly check if they are being used for a Unix server build and throw exceptions to prevent that. Commenting out those ex ...
Input Key Selector's Set Text Style does not change Text Style when given Text Style Variable
UE - Editor - UI Systems - Feb 6, 2020Input Key Selector's Set Text Style does not change Text Style when given Text Style Variable ...
BuildGraph build fails if Use Unity Build and Use PCH Files are set to false in BuildConfiguration.xml
UE - Online - Jun 23, 2017Using BuildGraph to create a local binary build of the engine fails if the BuildConfiguration.xml file has bUseUnityBuild and bUsePCHFiles both set to false. The build fails due to some missing Json ...
Get Material Instance ___ Parameter Value not working for Blend Parameter
UE - Rendering - Architecture - Materials - Dec 2, 2022Reproduced 3/3 times, issue also occurs in //UE5/Release-5.0 - CL 20979098 Binary. Confirmed NOT a Regression. ...
Inaccurate motion vectors when using different position binding in renderer
UE - Niagara - Rendering - Jul 27, 2023Even though the particles are not moving, and the velocity is zero, the output motion vectors are non-zero. This seems to only happen if using two sources of particle positions. ...