Unreal Engine Issues
Unreal Engine Issues
Projects crash when launching onto Firefox 64-bit
UE - Platform - Mobile - May 8, 2017QAGame crashes when it launched onto Firefox. The following exception occurs with the error message:*Expression (0) failed in D:\UE4_Dev-Rendering\Engine\Source\Runtime\Core\Private\Async\TaskGraph ...
When adding the UIRenderer to the Movie Render Queue, the rendering output is a difference in PIE and MRQ.
zComponent - Archive - Dec 5, 2023UI rendering in PIE and UIrenderer rendering in MRQ produce different output results. This is because when dealing with fades in the UI, the rendering results should not be different. Workaround ...
Deleting a spline point of a spline blueprint then moving crashes editor
Tools - Jul 7, 2015If you delete an end point of a spline blueprint and then attempt to move the blueprint the editor will freeze and eventually crash. Frequency: 1/1 CrashReporter: [Link Removed] ...
LOD ScreenSize per platform is not reflected in the mobile preview
UE - Platform - Mobile - Systems - Jan 31, 2023in 5.0 or 5.1, MinimumLOD per platform can be previewed in the mobile ES3.1 preview mode, but It seems that the LOD ScreenSize per platform is not reflected in the mobile preview. ...
[CrashReport] UE4Editor-CoreUObject!UObject::SetLinker(FLinkerLoad *,int,bool) [UObjectLinker.cpp:107]
UE - Foundation - Core - May 13, 2019Comment from user in crash group:I updated unreal engine to 4.22.1 and changed the project version from 4.21.2 to 4.22.1 and now it crash whenever i open a map Generated from CrashReporter ...
Unwanted black boundaries are displayed in a vertical split-screen with 3 players.
UE - Gameplay - Dec 2, 2019Floating point error from UGameViewportClient::SplitscreenInfo causes this issue. FMath::TruncToInt( 3240 /*ViewportSize*/ * 0.333f/*Ratio in SplitScreenInfo*/ ) = 1079 I suggested a following t ...
Crash during Datasmith file import when not using Keep Hierarchy
TM - Interoperability - Jun 24, 2025Reported to support. The user has reported that one of their .udatasmith files will consistently crash in TM 2025.1.1 during import. This was consistently reproducible when importing using Collaps ...
Animated characters may appear in A pose after loading a file with Path Tracer enabled
TM - Rendering - Mar 12, 2025When saving a file with Path Tracer enabled at the time of save, animated characters will appear in an A pose state. This will persist until Path Tracer is disabled. Occurs in Twinmotion 2024.1.2 a ...
Meta Allowed Class Doesn't Allow All The Included Classes
Tools - Dec 24, 2019The Meta Allowed Classes specifier doesn't allow the user to assign anything of the second type. Found in 4.24.1 CL#10757647 Reproduced in 4.23.1 CL#9631420, 4.25 Main CL#10868506 ...
Plugins are not creating shipping versions on package on Mac 4.23 Preview
UE - Foundation - Cpp Tools - Jul 15, 2019When you try to package a plugin on Mac in 4.23.0 Preview 1 there is no Shipping folder generated. This was verified to not happen in 4.22.3 (via Epic Launcher). Found in 4.23.0 Preview 1 CL# 72363 ...