Unreal Engine Issues
Unreal Engine Issues
Twinmotion sign-in error when attempting sign-in inside app
TM - Core - May 18, 2026Reported in SF [Link Removed] Attempting to sign into Twinmotion from within the TM 2026.1 editor results in a consistent sign-in error using the sign-in buttons. Initial sign-in during launch whe ...
Panini Lens Projection and Post Process buffers broken
UE - Rendering - Graphics Features - Mar 9, 2026Panini Lens Distortion does not appear to affect some buffers (SceneDepth, CustomDepth, WorldNormal, etc.) consistently. These buffers behaved correctly in 5.3 ...
Vertex Interpolate Node Doesn't Work with Lightmass
UE - Graphics Features - Lumen - Aug 8, 2018The vertex interpolate node doesn't work with lightmass. Found in 4.19 CL# 4033788, 4.20 CL# 4233996, and 4.21 CL# 4258917 ...
[CrashReport] UE4Editor_Kismet!FBlueprintGlobalOptionsDetails::CanDeprecateBlueprint() [blueprintdetailscustomization.cpp:5127]
UE - Gameplay - Blueprint Editor - Jul 19, 2017This is a common crash affecting users in 4.15 and 4.16, affecting over 200 unique users so far. User Descriptionsattempt to import bp from example Source Context 5124 { 5125 // I ...
Android Volume Up/Down input events no longer functioning
UE - Platform - Mobile - Aug 23, 2018Android Volume input events have stopped triggering in 4.20 Tested on Pixel XL (8.0) Also occurring in Main at CL 4309299 ...
Difference in Shader Complexity view mode between Static Mesh and Painted Foliage Actors after Enabling 'Dbuffer Decals' in Project Settings
UE - Graphics Features - Oct 19, 2016The 'Shader Complexity' view mode is rendering differently between regular Static Meshes and Painted Foliage instances after enabling 'DBuffer Decals' The user is reporting that this does not seem ...
Volumetric Light Fog Leak through objects
UE - Graphics Features - Dec 31, 2018Any environment with volumetric fog enabled will have a light leak which appears through objects. Found in 4.20 CL# 4369336, 4.21 CL# 4613538, 4.22 CL# 4666322 ...
Display error when removing foliage instances in standalone or built game
UE - World Creation - Worldbuilding Tools - Foliage - Feb 12, 2018This bug has different behavior depending on the engine version. When tested in 4.19 Preview 4, the 1M_Cube meshes do not render in the standalone/built game. In 4.20, the meshes render but some m ...
Sockets Duplicate When Mesh is Reimported
Tools - Dec 21, 2017When a static mesh that already has sockets created in it's original third party program is reimported into the editor, it's sockets are duplicated. Going from 10 to 20 on reimport. ...
Can't import FBX animations
Tools - Jul 23, 2018When importing Animation FBX files into 4.20 the following error is received: "Failure to Import - Mesh contains root bone as root but animation doesn't contain the root track." The importing proce ...