Unreal Engine Issues
Unreal Engine Issues
Drag and Drop Operations Don't Work Correctly When "Render on Phase" Is Enabled In a Retainer Box
UE - Editor - UI Systems - Slate - Jan 31, 2020Drag and drop operations don't work correctly when "Render on Phase" is enabled in a retainer box. When "Render on Phase" is disabled the drag and drop operations work as expected. In 4.23.1 the dr ...
Volumetric Lightmaps Persist When Opening Different Level
UE - Graphics Features - Lumen - Feb 24, 2020When moving between levels with built lighting volumetric light maps persists between levels. Workaround: Load the same level twice. Found in 4.24.2 CL#11100242 Reproduced in 4.26 Main CL#11574810 ...
Can't connect nor send packet via TCP socket in iOS
UE - Platform - Apple - Jun 9, 2020TCP Socket messaging in iOS seems not working. ...
Pasting timeline components into another actor and then choosing "cancel" on fix self context function references results in a broken state
UE - Framework - Components - Sep 13, 2021upd. Regression was checked on //UE4/Release-4.26 CL 15973114, issue was reproduced. Regression - No ...
[Quartz][Crash] - Subscribing to All Quantization Events and then playing a sound on all Quantization boundaries crashes the editor
UE - Audio - Jun 3, 2021Hit this when I made a blueprint and Subscribed to ALL quantization events instead of the one I was interested it and tried to use all of them as my Quantization Boundary. The alt title of this bug ...
It is possible for PreLoadScreen to leak memory when an EngineLoadingScreen returns IsDone while still loading
UE - Rendering - Graphics Features - Jan 9, 2025It is possible for a class that implements IPreLoadScreen to leak memory if GetPreLoadScreenType returns EngineLoadingScreen and IsDone returns true before the engine signals loading is completed vi ...
OverrideVertexColor causes a crash on mobile renderer
UE - Platform - Mobile - Jan 8, 2026Setting Allow CPU Access on the mesh, or setting bSupportsManualVertexFetch=1 in Engine.ini, avoids the crash. ...
Ending a GameplayAbility from an AbilityTask created by the same GameplayAbility does not correctly end the AbilityTask, and it continues ticking.
UE - Gameplay - Gameplay Ability System - Feb 2, 2026When a GameplayAbility is ended from within a child AbilityTask, the AbilityTask is not cleaned up correctly. As a result, even though the GameplayAbility is no longer active, the AbilityTask contin ...
MakeEditWidget specifier does not create edit gizmo in blueprint editor
UE - Gameplay - Blueprint - Jul 27, 2015Using the MakeEditWidget specifier inside a UPROPERTY macro and creating a blueprint based on the class will show the translation gizmo inside the main editor viewport but the gizmo will not show up ...
Conflicting FName for components freezes the editor with no warning
UE - Foundation - Core - Jun 24, 2015If two code components have the same TEXT("") name in the CreateDefaultSubobject call the code will compile correctly but the editor will freeze when adding an instance of the class or classBP to th ...