Unreal Engine Issues
Unreal Engine Issues
Project Crashes on Open when Implementing An Interface and Its Duplicate
UE - Gameplay - Blueprint - Apr 25, 2016The linked project crashes on open after attempting to implement an interface and a duplicate of that same interface with different function names. This has not been reproduced in a clean project, h ...
WPO is incorrectly generated on materials using Material Attributes as input to Landscape Layer Blend node
UE - Rendering - Architecture - Materials - Jan 31, 2024This comes from this UDN : [Link Removed] It occurs with this setup : [Image Removed] , where Set Material Attributes expressions act as inputs to the Landscape Layer Blend material expression. ...
Water plugin's RVT/ISR shader permutations fail PSO creation with instanced stereo (D3D12 SM6)
UE - Rendering - RHI - Jun 4, 2026With Instanced Stereo Rendering enabled and the Water plugin enabled (default), PSO precaching speculatively compiles WorldGridMaterial × FWaterVertexFactory* permutations for the Runtime Virtual Te ...
Distance Fields no longer work with instances when PIE/Simulate
UE - Graphics Features - Apr 20, 2015When using distance fields with instance meshes from the foliage tool everything works correctly, however, when simulating or PIE the distance fields will be removed. This working correctly in 4.7.5 ...
World Composition Browser sublevels register as edited/needs to be saved when levels browser is closed and reopened
UE - LD & Modeling - Terrain - Landscape - Mar 13, 2015Sublevels appear dirty when the level browser is closed and re-opened. ...
Altering Player Controller in Gamemode resets upon reloading project
UE - Gameplay - Blueprint - Nov 26, 2014If a user sets the player controller to a custom Player Controller inside of a gamemode, then compiles, saves, and closes both the blueprint and the editor. Upon reloading the player controller in t ...
Skeletal mesh always registers as Dynamic when testing collision
UE - Gameplay - Oct 26, 2016Skeletal meshes do not respect collision changes from World Dynamic, always returns as Dynamic. Regression (no) issue (does) occur in 4.12.5 ...
Engine crashes when adding 'Tick' to HideCategories in a BP or C++ project
UE - Gameplay - Blueprint - Mar 6, 2015When adding the word 'Tick' to HideCategories in a blueprint or C++ project, the Editor crashes, with a crash reporter. ...
4.23 UpdateGrass took twice time than 4.22
UE - World Creation - Worldbuilding Tools - Foliage - Sep 12, 2019Unable to kill UnrealBuildTool, UBT no longer propegates sigterm
UE - Core - Cpp Tools - UnrealBuildTool - Aug 24, 2026When UBT is launched through one of the standard wrapper scripts, Ctrl-C no longer cancels the build. The `dotnet UnrealBuildTool.dll` process and its compile actions keep running to completion in t ...