Unreal Engine Issues
Unreal Engine Issues
Adding Variable to Struct (Exposed on Spawn) breaks SpawnActor functionality without error/warning
UE - Gameplay - Blueprint - Aug 16, 2018Adding a variable to a Struct used with SpawnActor breaks functionality without warning. Workaround: Clear Class from SpawnActor and reassign same class User Cites Blueprint Compile manager as fau ...
Rendered landscape heights for ES31 doesn't match SM5 since engine version 4.25
UE - LD & Modeling - Terrain - Landscape - Jun 4, 2020Switching between SM5 and ES31 views in the Editor shows some small variation in landscape heights. ES31 heights are stored in the vertex with some slight lossy compression so subtle variation can ...
World Partition causes client to disconnect from dedicated server
UE - World Creation - Worldbuilding Tools - World Partition - Sep 14, 2022When using connecting to a World Partition level on a dedicated server the client get's disconnected immediately. I tested this with a non WP level and the client connected with no issues. I've inc ...
Unable to affect setting cubemap blend in skyLight and reflections on transluscent materials
UE - Rendering - Architecture - Oct 17, 2023Attempting to blend SkyLight Cubemaps via the SetCubemapBlend function to blend between different Cubemaps to make the changes seamless is not reflected. As a workaround, in LumenTracingCommon.ush, ...
Drag and drop does not work from a window created with PySide
UE - Editor - Workflow Systems - Feb 5, 2026The cursor position is no longer updated during drag and drop, so drag-over events cannot respond correctly.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 ...
AnimNotifyState with the same class, but different content at the same time will only one be triggred
UE - Anim - Runtime - Oct 26, 2022UDN Case : https://udn.unrealengine.com/s/question/0D54z00008G3EmwCAF/two-c-based-animnotifystate-with-the-same-class-but-different-content-at-the-same-time-will-only-one-be-triggred?fromCase=1 ...
The Unreal Engine building dialog either does not appear or is only visible for a brief second
UE - Virtual Production - Nov 18, 2022This is not a regression against 5.0. Tested in //UE5/Release-5.0 CL20979098 However, as users have pointed out, this is a departure from UE4. The same process in 4.27.2 demonstrates the building d ...
Lumen artifacts on splitscreen during camera cuts
UE - Graphics Features - Lumen - Apr 18, 2024A UDN licensee has pointed out that they are seeing unresolved Lumen reflection artifacts when they are running their game in split-screen mode. A video of this behavior is found in the Related tab ...
Pathtracer - Odd results from any material adjusting normals to complement world position changes
UE - Graphics Features - Path Tracer - Sep 30, 2025Someone on the forums is reporting a possible bug with Pathtracer and any material that adjusts normals to complement world position changes. See pic attached. Reporting forum thread:https://foru ...
Multiplayer VR Preview Support Broken
UE - Platform - XR - Jul 11, 2016The VR Preview used to work with multiple clients but now only works with the first client. This makes testing multiplayer features difficult or impossible as there is no way to change which client ...