Unreal Engine Issues
Unreal Engine Issues
Crash when setting Retainerbox scale is set to 0 at runtime
UE - Editor - UI Systems - Jan 22, 2021Crash at runtime when Retainerbox scale is set to 0. The call stack indicates that the size of RenderTarget2D is set to 0. Attached repro project sets the scale of the RetainerBox that wraps the Im ...
Setting an overlay's alpha to 0 does not display as fully transparent
Tools - Feb 19, 2020Safe zone overlay ignores alpha when set to 0.0 in DefaultEngine.ini. Tested: 4.23.1 CL#9631420 , 4.25 CL#11341939 ...
[Feature Request] Improve the comment on the Finterp family of functions to better explain the parameters and maybe edge cases like what happens when speed is 0)
UE - Gameplay - Apr 24, 2017Some users are finding the result of an interp speed of 0 for the FinterpTo node to be unexpected. The reasoning expressed is that if the speed is equal to 0 that there should be no change. This would ...
Raytraced lights with Source Length > 0 behave incorrectly with Megalights
UE - Rendering - Features - Ray Tracing - Mar 26, 2025When Megalights is enabled, light can leak into areas that should be occluded for lights with smallish (5.0) source length and source size. [Image Removed][Image Removed] This was taken with r.Ray ...
Editor will freeze if anim composite has an animation with a notify and length of 0
OLD - Anim - Mar 21, 2019An anim composite will freeze the editor if one of its animation segments has a a notify and a length of 0 or less. Debugging shows that the engine is stuck inside UAnimSequenceBase::GetAnimNotifies ...
Crash on garbage collection - Encountered 20 object(s) breaking GC Clusters assumptions.
UE - Foundation - Core - Aug 15, 2018Garbage collection crash during opening cinematic. Note after crashing and relaunching the game the saved file appears as 8% complete instead of 0%. Note this crash is also occurring with //UE4/D ...
Ad banner is displayed incorrectly on Android 7.0 devices
UE - Platform - Mobile - Feb 24, 2017GameActivity.java needs to be updated to show the ad popup window on Android 7.0 devices. GameActivity.java uses Gravity.BOTTOM or Gravity.TOP to place the ad. One thing to try would be to edit ...
Console command “showflag.rendering 0” causes crash
UE - Rendering - Architecture - Jul 10, 2025A crash occurs when the console command “showflag.rendering 0” is executed. This does not occur in UE5.5, so it is a iassue in UE5.6. ...
Assertion failed: GEditor->GetSelectedActorCount() == 1 in FLevelEditorActionCallbacks::Paste_CanExecute
Tools - May 3, 2017This is a high frequency crash occurring for our users. It appears to be the same crash reported in [Link Removed], however that was fixed in 4.15.0, and the specific repro steps are verified to no ...
Ensure failure !bStaticCall nativizing blueprint calling blueprint function library function
UE - Gameplay - Blueprint Runtime - Jan 26, 2017With exclusive nativization enabled and a blueprint calling a blueprint function library function a project fails to package due to an ensure failure !bStaticCall in BlueprintCompilerCppBackend.cpp. ...