Unreal Engine Issues
Unreal Engine Issues
Disabled Skeletal Mesh Sections cause Shadow Ray Tracing Flicker
UE - Graphics Features - Ray Tracing - Dec 12, 2025If a skeletal mesh has a section disabled the ray traced shadow will flicker when the camera or itself moves. Previously in 5.6.0 no raytraced shadow would appear if a section was disabled. This wa ...
Crash during .zfprj import when Feature detection quality is set to High and Use mosaic images as feature source is set to Yes
RS - Alignment - Dec 19, 2025Found in 2.0.0.118621 (R200). It appears that the combination of Feature detection - High and Use mosaic images as feature source during .zfprj LiDAR import - Yes. causes a crash. Outcome: RS ...
Matinee not triggering when moved from one level to another
Tools - Oct 19, 2015It appears that if you create a Matinee in a Sublevel, and then subsequently move the matinee between levels. It will not keep associations with the attached actors in the Matinee and not trigger e ...
Asset produces error "Failed import for object property" upon loading editor
UE - Gameplay - Blueprint - Jan 18, 2016Filepath for asset referenced in Gamemode blueprint produces error: /Game/ACustom/Code/cBP_Gamemode: Failed import for ObjectProperty /Game/ACustom/HUD/Game_UI.Game_UI_C:STMSG Fix up redirectors ...
Instance Static Meshes spawned at Runtime do not have collision
UE - Gameplay - May 8, 2015Spawning an Instance Static Mesh at runtime does not have collision. This issue appears only in 4.8 Preview 1 and the 4.8 Release branch (tested on CL-2540862), but is fixed in Main Branch as of Ma ...
Light Shaft Occlusion causes exponential height fog to render incorrectly in stereoscopic
UE - Platform - XR - May 26, 2016Enabling Light Shaft Occlusion causes exponential height fog to render incorrectly at certain viewing angles in stereoscopic. This does not reproduce once light shaft occlusion is turned off on the ...
Vehicle wheels have no collision on HTML5
UE - Platform - Mobile - Dec 2, 2016A Wheeled Vehicle's wheels do not have collision when packaged into an HTML5 game. Regression?: Yes This issue did not occur in 4.13.2 Note: This is currently blocked from testing in Main as the P ...
Struct in Object class will not populate if an expose on spawn struct pin is split on "Construct Object from Class" node
UE - Gameplay - Blueprint - Jul 29, 2016Struct in Object class will not populate if struct pin split on "Construct Object from Class" node. This does not appear to happen to other variable types. Workaround Do not split the struct pin, ...
Crash when a material with a texture parameter is deleted when it has instances with static permutations
UE - Graphics Features - Dec 28, 2016This was the simplest solid repro I could get on this bug. The callstack is similar to [Link Removed] Also came across several Shader Compiling Manager crashes while attempting to repro this crash ...
Content Examples: Blueprints_Overview Stand 1.7 Spark particle system does not fire from coin
Docs - Samples - Jan 19, 2017During runtime, the red coin in Stand 1.7 on the Blueprints_Overview map of Content Examples should emit a large spark particle system 5 times. While investigating, I tried disabling "Use Fixed Rel ...