Unreal Engine Issues
Unreal Engine Issues
Missing materials on the rear lights of library vehicles
TM - Content - Oct 24, 2025Reported in SF [Link Removed] The rear light material on Twinmotion library vehicles is not present on many vehicles in TM 2025.2. Confirmed affected vehicles are in the following categoriesCarsTw ...
Rendered panoramas using Lumen may be overexposed
TM - Rendering - Sep 30, 2025Reported in SF [Link Removed] Lumen Panorama renders in 2025.2 may appear overexposed compared to the viewport, or when comparing the same render produced in 2025.1.1 This only appears to occur wi ...
Torque curve makes no difference on vehicle movement
UE - Gameplay - Blueprint - Sep 11, 2015When changing the Torque Curve in a Wheeled Vehicle's Vehicle Movement Component, the values set don't affect the torque of the vehicle. ...
Crash importing FBX
UE - Editor - Content Pipeline - Import and Export - Jan 7, 2015User reporting as a 4.7 Bug, but no crash report for this bug available for 4.7. Same bug found reported for 4.6.1: Crash Report: [Link Removed] [Code] <unknown module>! KERNELBASE!RaiseExceptio ...
Startup Movies Fail to Play when Audio Devices are Disabled
Tools - Feb 1, 2016If a user launches a project in Standalone mode and has a Startup movie while the audio devices on the computer are disabled, the movie will fail to play. As soon as you re-enable an audio device, ...
Animations are stuttering in Game Preview Server window
UE - Networking - Jul 27, 2018When 'Run Dedicated Server' is unchecked and you run PIE with 2 or more clients, all client's animations are stuttering on Game Preview Server window. This does not happen when Run Dedicated Server ...
Standalone Window Size Not Displaying In Fullscreen
Tools - Jun 15, 2016Setting the standalone window size does not seem to have any effect, and using the -fullscreen parameter does not display the window in fullscreen. Setting the Standalone Window Size to 1920x1080 a ...
Value for how long jump key is held is not updating while PIE and max jump count is 0
UE - Gameplay - Apr 14, 2017I'm at a loss for what is going on here. This was observered while working through the first 2 steps of UEQAT-2780 (JumpTest.PNG shows those steps). This works in 4.15.2, but not in 4.16. If you cha ...
If any light source is deleted, and a single light has its visibility state changed in LightMixer, all the other lights in the scene that were invisible turn visible
UE - Virtual Production - Tools - Jul 31, 2025If any light source is deleted, and a single light has its visibility state changed in LightMixer, all the other lights in the scene that were invisible turn visible. The behavior only shows after d ...
Screen Space Ambient Occlusion Artifacts
Docs - Samples - Apr 3, 2015Flickering occurs when using the Post Process Ambient Occlusion (Screen Space AO). This is more noticeable when using stronger values entered into the AO fields. I checked these settings in both 4 ...