Unreal Engine Issues
Unreal Engine Issues
Mouse Up Detection lost inside Scrollbox when dragging
UE - Editor - UI Systems - Feb 28, 2017Mouse Up Detection lost inside Scrollbox when dragging and releasing inside. This issue occurs when trying to detect on mouse up for a scroll box Regression: This issue also occurs in 4.14.3 ...
SetVectorParameterValueOnMaterials In Construction Script Not Working in Packaged Game
UE - Gameplay - Blueprint - Mar 1, 2017Set Vector Parameter Value on Materials doesn't seem to have an effect in packaged games if used in the construction script. Using it on Begin Play works as expected. This did not occur in 4.14.3. ...
OnClicked event of UMG button fires once in twice if virtual joystick is receiving input.
UE - Editor - UI Systems - Oct 14, 2015OnClicked event of UMG button fires once in twice if virtual joystick is receiving input. Both Andorid and iOS devices are affected. This issue is found with 4.9 update. under 4.8 are fine. ...
Curve name cannot be changed when using FRuntimeCurveLinearColor
UE - Anim - Sequencer - Mar 28, 2017When a custom data asset class have a FRuntimeCurveLinearColor defined variable, the curve name in the editor shows as "None" and cannot be edited. Regression: No - same behavior exists in 4.14.3 B ...
Animation Track in Shot Does Not Animate With Evaluate Sub Sequences In Isolation Enabled
UE - Anim - Sequencer - May 15, 2018When Evaluate Sub Sequences in Isolation is enabled in a shot, other shots inside the same sequences only play the transform track and do not play their animation track Does not affect 4.18.3 Relat ...
Disabling "Apply Fogging" Doesn't Work for Translucent Material with Volumetric Fog
UE - Graphics Features - Jul 6, 2018Translucent materials with "Apply fogging" disabled will be affected by volumetric fog. Found in 4.19 CL# 4033788, 4.20 Preview 5 CL# 4173640, and 4.21 ...
Default Values missing from Local Variables in Blueprint Actor Construction Script
UE - Gameplay - Sep 19, 2019Specific to the Blueprint Construction Script, Local Variables cannot have their value set in the Editor, because the "Default Value" section of the Details tab will never appear. This only affects ...
Toggling Material Layer visibility in Parent Material doesn't propagate to children
UE - Rendering - Architecture - Materials - Jun 9, 2026When Material layer visibility is toggled on the Parent Material in a Material hierarchy, only the Parent’s layer visibility is affected, the children are not. Saving the Parent material has no effe ...
Editor Crash when Add Client button is used
Tools - Jan 30, 2017If the "Allow late joining" option is turned on in Editor Preferences, using the Add Client button in PIE will cause a crash on Exit. Crash happens immediately if using VR Preview ...
Mutable references MetaHumans heads directly, but DNA Assets are private
UE - Runtime - Mutable - Sep 18, 2025When we switched our project to 5.6.1 This error appeared on build. The compilation of the Mutable assets in the editor is not reporting any issue. ...