Unreal Engine Issues
Unreal Engine Issues
New C++ Class (actor) fails to build
UE - Foundation - Cpp Tools - Mar 8, 2022While trying to create a C++ actor to test if it can be created with a custom Copyright notice specified in Project Settings, the Live Coding window returns a "Build failed" and error of: "ERROR: U ...
Multiple templates have Can't Find File warnings when cooking content for Mac
UE - Foundation - Core - Cooker - Jan 13, 2016The following Can't Find File warnings appear for the Flying Code and BP projects when cooking content for Mac.MainFrameActions: Cooking (Mac): UE4Editor: [2016.01.13-20.14.37:469][ 0]LogInit:Displ ...
Sphere Mask ArgInvHardness missing multiplication
UE - Rendering Architecture - Materials - Jun 27, 2025Hi Epic, In MaterialExpressions.cpp UMaterialExpressionSphereMask::Compile(), hardness is not calculated the same way in both <if> conditions. One is missing a multiplication by 0.01f. Specificall ...
Replacing blueprint assets causes editor to crash
UE - Gameplay - Blueprint - Jun 1, 2015When attempting to replace references of one blueprint with another a number of error message windows pop up ([Link Removed]) and the editor will crash. This is a regression since it was working in ...
Editor crash when Use Dynamic Material Instance is set to "True" on landscape
UE - LD & Modeling - Terrain - Landscape - Mar 23, 2018Setting "Use Dynamic Material Instance" to true in the landscape details will cause the editor to crash. Reproduced in 4.19.0 CL 3944462 and 4.20 Main. This feature is not available in 4.18.3. ...
After adding MovieSceneObjectPropertyTrack from BP or Python, clicking the pull down of the added track occurs crash
UE - Anim - Sequencer - Sep 6, 2019When MovieSceneObjectPropertyTrack is added from BP or Python, PropertyClass of UMovieSceneObjectPropertyTrack becomes null, so it crashes with the following processing of SPropertyMenuAssetPicker : ...
Painted Instanced Foliage Actors Rendering Multiple LOD's Simultaneously
UE - World Creation - Worldbuilding Tools - Foliage - Sep 1, 2015When using a mesh as an Instanced Foliage Actor the Levels of Detail are always rendered. The user reporting this issue mentions he needs to use extreme different LOD value ranges for screen size wi ...
Legacy HLOD Nanite Meshes Always Rendering in 5.5
UE - World Creation - Worldbuilding Tools - HLOD - Mar 17, 2025From licensee: We are using the legacy HLOD system in our game. With 5.5 there was a change to FSceneProxyBase::DrawStaticElementsInternal() where the implementation was removed (https://github.com ...
r.ScreenPercentage.Editor does not function
UE - Graphics Features - Jun 2, 2016Setting r.ScreenPercentage.Editor does not affect the upsampling/downsampling of the viewport in the editor. Regression: YES - the console command correctly adjusted the screen precentage in 4.11.2 ...
Package fails to load due to EditorOnly data when launched onto Mac or Windows
UE - Foundation - Core - Jun 28, 2017LogPlayLevel: QAGame: [2017.06.28-14.09.14:706][ 0]LogLinker:Warning: Unable to load package (../../../QAGame/Content/UMG/UMG_Sprite.uasset). Package contains EditorOnly data which is not supported b ...