Unreal Engine Issues
Unreal Engine Issues
Iterative cook does not cook only changed content in Binary UnrealFrontend
UE - Foundation - Core - Cooker - Feb 7, 2017This is not a regression as it occurs in 4.14.3. Also this did not occur in a source build of UFE from Github. Excerpt from the logs:UE4Editor-Cmd: [2017.02.07-18.58.10:328][ 0]LogCook:Display: ...
Dark Artifacts Appear On Meshes With "Use As Occluder" After Enabling DBuffer Decals
UE - Graphics Features - Feb 13, 2017Objects set to "us as occluder" will create dark artifacts from certain view angles. For this to occur "DBuffer Decals" need to be enabled in the project settings. The licensee has noted that addi ...
[CrashReport] Assertion failed: FPlatformOpenGLDevice::FPlatformOpenGLDevice
UE - Rendering - Architecture - RHI - Jan 9, 2018Comments from users:tried with -opengl4tried to start with -force-opengl instead of -opengltried to run in opengl modetried to run in opengl mode due to DX11 feature level 10.0 error. (DirectX is in ...
Widget components set as IsVariable have non-functional settings/variables
UE - Editor - UI Systems - Feb 12, 2018There is an issue occurring where Widget components set as IsVariable have non-functional settings/variables. This issue occurs with multiple widget components. This does not appear to be a regressi ...
Certain materials are overly bright with Ray Traced Global Illumination denoiser
UE - Graphics Features - Lumen - Mar 14, 2019Ray Traced Global Illumination is causing some materials to glow extremely bright Disabling r.raytracing.globalillumination.denoiser fixes the issue In 4.22 preview 5 binary (5365847) the result i ...
Arrays of Soft Object local variables are not captured for reference graph
UE - Gameplay - Blueprint - May 20, 2019This bug comes from https://udn.unrealengine.com/questions/492861/view.html and is a very similar problem to [Link Removed] The issue is that the code that harvests soft object references stored in ...
Static lights become stationary after toggling visiblity of level in packaged build
UE - Rendering - Features - Jun 11, 2025In 5.5, there is a regression with baked lighting where static lights become stationary lights when a level is hidden and then made visible again. This happens in packaged builds and shows up as sta ...
PlayerCollision visualization incorrect on LandscapeSplineMesh when Nanite is enabled
UE - Rendering - Features - Nanite - Dec 3, 2025From licensee: I’ve found an issue with the visualization of PlayerCollisions when using LandscapeSplineMesh with a mesh that has Nanite enabled. The Chaos collisions shown in the Chaos Visual Debu ...
FZipArchiveCompressTest failing to compile in non-editor Development builds
MetaHuman - Jul 28, 2026`ZipArchiveTest.cpp` fails to compile for non-editor targets in Development configuration. `FZipArchiveCompressTest::RunTest` constructs `FZipArchiveReader`, which is editor only, but that section ...
Changing the Curve Asset in a Material Instance That Uses a Material Layer Crashes the Editor
UE - Graphics Features - Apr 22, 2019Changing the Curve Asset in a Material Instance That Uses a Material Layer Crashes the Editor. Found in 4.20 CL# 4369336, 4.21 CL# 4753647, 4.22 CL# 5660361, 4.23 CL# 5974510 ...