Unreal Engine Issues
Unreal Engine Issues
Incorrect Lumen Scene direct lighting when objects behind masked landscape
UE - Rendering - Features - Lumen - Oct 5, 2025When objects are placed behind or beneath a masked landscape and r.Lumen.HardwareRayTracing.SurfaceCacheAlphaMasking is enabled, the direct light evaluation is incorrect. There are two workarounds, ...
Drag and drop does not work from a window created with PySide
UE - Editor - Feb 5, 2026The cursor position is no longer updated during drag and drop, so drag-over events cannot respond correctly. Commenting out the following code in WindowsCursor.cpp works as a workaround ( the behavi ...
Set World Location Not Working on Skeletal Meshes with Simulate Physics Enabled
UE - Gameplay - Mar 3, 2016When a skeletal mesh is set to simulate physics, using the Set World Location node to set the world location of the mesh does not seem to be working. Turning simulate physics off causes the mesh to ...
ExpandEnumAsExecs always uses first Exec if an argument name matches Enum value
UE - Framework - Blueprint - Jan 13, 2023Reproduced 3/3 times, issue also occurs in //UE5/Release-5.0 - CL 20979098 Binary. Confirmed NOT a Regression. EnumBugBP uses two enum cases and three argument cases for 6 total permutations:Enum w ...
Duplicated Blueprint Causes Incorrect Target for Events
UE - Gameplay - Blueprint - Oct 15, 2015Duplicating a blueprint that has a node hooked up to BeginPlay causes the BeginPlay in the duplicate blueprint to target the original blueprint. This does not appear to affect functionality. Occur ...
"Diff Against Depo" Does not Display Changes to AI Controller Property
UE - Gameplay - Blueprint Editor - Mar 2, 2016When using Diff Against Depot to see changes made to a file since it was last checked in, changes made to the AI Controller default property are not displayed under the defaults section. Found in ...
Lens Flare and Bloom do not work for local multiplayer
UE - Graphics Features - Jan 22, 2015Using a post process volume with lens flare and a bloom enabled do not appear functional in split-screen multiplayer. Other selections in the PPV work as intended (ie. Fringe, Ambient occlusion). ...
Editing the Default Value of a Struct Variable Disconnects Pins in Blueprints
UE - Gameplay - Blueprint - Mar 1, 2016When using a struct in a blueprint, if you go into that struct and alter the default values of one of the variables, any pins that were used relating to that variable are disconnected in blueprints. ...
Struct array variables interpret multiple Structs as the same if they have the same values
UE - Gameplay - Blueprint - Jul 7, 2015Struct array variables interpret multiple Structs as the same if they have the same values. This does not occur if the values in the Structs added to the array are different. Test project in 4.8.1 ...
[DataLayer] Optimize Data Layer runtime state replication
UE - Engine Scaling - Streaming - Data Layers - Dec 7, 2023[Link Removed]This issue occurs only when I have a lot of RDLs (I tested 2500 and 1600). I tested with 6 RDLs and had no issuesI also noticed in the server log an error when a lot of RDLs are presen ...