Unreal Engine Issues
Unreal Engine Issues
Precomputed AO Mask renders with value of zero after building lighting
UE - Rendering Architecture - Materials - Jan 13, 2023Regression: Tested in UE5/Release-5.0 at CL 20979098, this issue does not occur so it is a regression. This issue occurs in 5.1 for both normal light building and GPU Lightmass building. In 5.0 th ...
Static lights become stationary after toggling visiblity of level in packaged build
UE - Graphics 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 ...
r.SupportPointLightWholeSceneShadows Set to False Causes Crash When Trying to Place a PointLight
UE - Graphics Features - Jul 25, 2018If you disable Support PointLightWholeSceneShadows and try to place a point light in a level the editor will crash. Current work around is put shadows to low from engine scalability settings. Wor ...
Staging DLC is reportedly broken
UE - Foundation - Cpp Tools - Automation Tool - Dec 16, 2015According to a licensee, StageFiles() is called with ExcludeWildcard that contains a directory name ("Engine/*") and bRecursive=true when building DLC. This is not supported by Directory.GetFiles(). ...
Editor crashes when opening several marketplace assets - Assertion failed: !HasAnyFlags
UE - Gameplay - Blueprint - Jun 22, 2016Editor crashes while attempting to open several marketplace assets. Allar's Generic Shooter Defuse Studios RTS Template JCInventory Frequency: 5/5 Regression (yes) issue (does not) occur in 4.11 ...
Shader Model 5 and Tessellation causes unintended effects on Linux
UE - Platform - Linux - Jul 6, 2016Using Shader Model 5 and tessellation on Linux gives strange results that are not present when used on Windows ex: 1) When using Shader Model 5 on Linux, turning on Translucent blend mode and Tesse ...
Get Class Defaults node disconnects output pins when project upgraded from 4.11 to 4.12
UE - Gameplay - Blueprint - Jun 7, 2016Upgrading a project from 4.11 to 4.12 causes Class Default nodes to disconnect their output pins from other nodes. If the node is reconnected and saved, it will disconnect again when the project is ...
PhysX errors when packaging for x86
UE - Platform - Mobile - Oct 27, 2016Packaging for x86 in ETC1 will generate PhysX errors and cause the package to fail. The following error will occur multiple times throughout the package:UATHelper: Packaging (Android (ETC1)): Unrea ...
ICU was built with timezones disabled for Android
UE - Platform - Mobile - Mar 23, 2017ICU for Android was built with U_TIMEZONE defined to 0, which means that ICU always considers itself to be in UTC, rather than use its default Android implementation. We should try and build ICU ag ...
ICU was built with timezones disabled for Linux
UE - Platform - Linux - Mar 23, 2017ICU for Linux was built with U_TIMEZONE defined to 0, which means that ICU always considers itself to be in UTC, rather than use its default Linux implementation. We should try and build ICU again ...