Unreal Engine Issues
Unreal Engine Issues
Unable to use drop down for tooltip widget
UE - Editor - UI Systems - Apr 23, 2019The tool tip widget drop down appears to be grayed out and unusable. This feature was available in the 4.18 version of the engine but not longer appears to be usable. ...
BeginPlay not called for Post-Process Anim Instance
OLD - Anim - Oct 29, 2019Post-Process Anim Instances do not have BeginPlay called. The proposed fix is to addif (PostProcessAnimInstance) { PostProcessAnimInstance->NativeBeginPlay(); PostProcessAnimInstance->Blu ...
Sequencer particle toggle tracks evaluate one extra frame
UE - Anim - Sequencer - Jul 1, 2020It looks like particle toggle tracks use TimeRangeToNumberRange which gives the incorrect range as a result of CL 10893518 which fixed [Link Removed]. ...
Deterministic cooking issue caused by ParticleModuleTypeDataGPU
UE - Rendering - Architecture - Niagara - Jan 18, 2021This problem is similar to the following case. [Link Removed] [Link Removed] It seems to have been fixed in 4.16, but the licensee reported it in 4.25. ...
Non-deterministic cooking issue in .uexp of level asset file
UE - Core - Data Pipeline - Cooker - Jan 17, 2023There is a deterministic cooking issue with .uexp map of level asset. [Link Removed] Closed is the similar issue fixing by ...
Can't connect Date Time and Time Spawn pins to math nodes
UE - Framework - Blueprint Editor - Feb 2, 2023we can do a "cheap fix" here by adding the "IgnoreTypePromotion" metadata to the date time functions, but there are some underlying issues with the FindBestMatching func in this case causing it to f ...
Light function materials using WorldPosition do not render correctly to volumetric fog if there is more than one
UE - Rendering - Features - Mar 27, 2023There is a one-line fix for this in a shader file, see their PR on GitHub:https://github.com/EpicGames/UnrealEngine/pull/10251/files ...
Crash when double clicking on RowStruct's CurveEditor
UE - Editor - Mar 15, 2024This problem can be reproduced with UE5.3 even after applying fix [Link Removed] Closed . We have verified this issue with U ...
Initialization error when creating FEventReply objects from Python
UE - AI Workflows - UI Systems - UMG - Nov 28, 2025the handled value passed to unlock_mouse is actually treated as unhandled, because FEventReply has no uproperty and no Identical()function of its own. Adding WithIdenticalViaEquality can fix this is ...
Start time of subtitle gets incorrectly modified at runtime
Tools - Apr 14, 2016The time field of a subtitle is incremented incorrectly at runtime. This is caused by the wrong array being modified by the subtitle manager when queuing subtitles. A fix is provided by the licensee ...