Unreal Engine Issues
Unreal Engine Issues
WorldPartitionActorDescs for LevelInstanceActors are broken when migrating world partitioned level
UE - World Creation - Worldbuilding Tools - Level Instances - Jun 13, 2023WorldPartionActorDescs will be restored to the correct properties when resaved. They can also be fixed by the WorldPartitionResaveActorsBuilder commandlet. ...
CreatePatchLibrary is broken
UE - Rendering - Architecture - Shaders - Nov 12, 2025It seems the FEditorShaderCodeArchive.LoadExistingShaderCodeLibrary missed some functions, use FEditorShaderCodeArchive.AddShaderCodeLibraryFromDirectory instead could fix the issue. ...
Megalights support for anisotropic materials
UE - Rendering - Graphics Features - Lumen - Apr 14, 2026A licensee noticed that SUPPORTS_ANISOTROPIC_MATERIALS is not passed to FShadeLightSamplesCS::ModifyCompilationEnvironment for MegaLights ShadeLightSampleCS. Adding it fixes the issue. ...
Crash in Nativized Packaged Game When Overriding Server Event and Calling Parent
UE - Gameplay - Blueprint Runtime - Aug 15, 2017A crash is occurring in a nativized packaged game when overriding a server event and calling the parent's implementation in a derived class. The crash doesn't seem to produce a detailed callstack. ...
Behavior tree assets marked dirty when opening in subeditor
UE - AI - Aug 16, 2016Found while I was fixing up other content, that Behavior Tree assets are being marked dirty by just opening them into sub editor. ...
The red time indicator for viewing curves in persona is slightly tilted
OLD - Anim - Sep 9, 2016The time indicator for curves in persona is slightly tilted off vertical. This also occurs in 4.13 main. ...
[CrashReport] UE4Editor-Kismet.dylib!FTabInfo::OnMouseDownHisory(FGeometry const&, FPointerEvent const&, TWeakPtr<SMenuAnchor,()
UE - Platform - Apple - Jul 20, 2017This is a common crash affecting Mac users in 4.16. It has occurred since at least 4.13 ...
Moving or renaming a file in the editor should execute a Perforce move command not a delete+add
Tools - Aug 31, 2016Moving or renaming a file in the editor erases its perforce history. It should execute a move not a delete + add to fix this ...
Hot reload iteration time regression.
UE - Foundation - Core - Oct 19, 2017Hot reload iteration times have been crippled ever since CL# 3332960, which was a fix for [Link Removed]. ...
IOS-Shipping memory managentment failed for std::string
UE - Platform - Mobile - Oct 8, 2018[Image Removed] [Image Removed] [Image Removed] if strip with -x option, it will fix this issue. ...