Unreal Engine Issues
Unreal Engine Issues
Missing materials on the rear lights and windows of library vehicles
TM - Content - Oct 24, 2025Reported in SF [Link Removed] The rear light material and window materials on Twinmotion library vehicles are not present on many vehicles in TM 2025.2. Confirmed affected vehicles are in the foll ...
Enabling wifi while a game is running causes the Lenovo S939 to freeze or crash
UE - Platform - Mobile - Jan 5, 2016When turning on the wifi connection on the device, the game either crashes on the device or it'll freeze for about 15 to 30 seconds. Devices: 5231_S939 (ARM Mali-450 MP4; 4.4.2) - occurs on 2894_G ...
Crash when Simulating in Editor after Painting Foliage
UE - Editor - Workflow Systems - Nov 29, 2016The engine crashes when simulating in the editor after painting foliage instances using the Foliage Tool. An important thing to note is that this crash does not occur if you switch out of the 'Foli ...
Lens Flares are appearing in Other Player's Windows
UE - Graphics Features - Jul 28, 2015On a Windows 8.1 Platform with an Nvidia 960 card, Lens Flares when playing with 2 Player's (without a dedicated server) are appearing in the wrong window. So, Player 1 is looking at sun, Player 2 ...
After loading a SubLevel from the PersistentLevel of WorldComposition, the offset of WorldComposition is applied when loading the SubLevel alone
UE - World Creation - Worldbuilding Tools - World Composition - Aug 30, 2018When loading a Sub Level from the Persistent Level of World Composition, the offset of WorldComposition is applied when loading the Sub Level by itself. The offset can be applied repeatedly when rel ...
Precomputed AO Mask is no longer working
UE - Graphics Features - Dec 23, 2015Precomputed AO Mask is no longer working in 4.11 Preview 1. This is a Regression from 4.10.x where this was working as intended. I've attached a zip file with the quick test that can be dropped in ...
Crash when Changing Source File and Re-Importing Mesh used in Mesh Particle System
UE - Graphics Features - Aug 2, 2016A licensee has reported a crash when re-importing a mesh being used within a Mesh Particle system. Regression? Yes, this crash does not occur in the 4.11.2 binary release. Link to Crash Logs: [Lin ...
[CrashReport] Mac crash - FCocoaRunLoopSource::Process
UE - Platform - Apple - Sep 14, 2017This is a somewhat common Mac crash that has occurred since at least 4.14 and into 4.17. Users have not provided any descriptions of their actions when the crash occurred. The callstack contains l ...
Reimporting a skeletal mesh by dragging FBX to content browser crashes editor
Tools - Nov 12, 2015Reimporting a skeletal mesh by dragging FBX to content browser crashes the editor. I suspect something is wrong with the FBX. The user reported that the data is from Blender. FBX file attached for ...
Add Movement Input does not work on any pawn that is not controlled by the player
UE - Gameplay - Player Movement - Oct 13, 2015Add Movement Input does not work on any pawn that is not controlled by the player. Note: this worked in 4.7.6 and earlier. Test project attached. In it, the Player Controller controlled by the acti ...