Unreal Engine Issues
Unreal Engine Issues
Two-sided property of materials saved to User Library not preserved
TM - Tools - Jul 22, 2026Materials with the two-sided property enabled do not retain this setting when saved to the user library, reverting to one-sided whenever applied to objects, making it impossible to save a material a ...
BlendSpace Loop Boundary Produces Inconsistent Sync Marker Data andTriggers an AnimSequence Follower Assertion
UE - Runtime - Animation - Jul 22, 2026Summary In UE 5.7.4, when a looping BlendSpace with Match Sync Phases enabled plays as a SyncGroup Leader and crosses its loop boundary during a transition to an external AnimSequenceFollower in th ...
Overwriting an anim sequence may scale the play rate of the anim instead of modifying underlying frame rate
UE - ACT Character - Anim in Engine - Jul 21, 2026The frame rate for an anim sequence is not being changed as expected when its being overwritten / re-imported. ...
GPU Validation texture barrier errors for SkyAtmosphere component
UE - Rendering - RHI - Jul 20, 2026A licensee reported that two SkyAtmosphere texture resources do not have proper memory transitions added by the RDG. This happens because in VolumetricCloud.usf, these textures are referenced via Vi ...
Viewport Controller Camera Control Regressions in UE5.8
UE - Editor - Jul 16, 2026In UE5.8 it appears some changes were made to the camera control and navigation in the editor viewports. You can no longer use controller and mouse simultaneously to control the camera. Previously ...
SetInputMode_GameOnly + windowed mode: Win+Arrow window snapping stops working after dragging window across monitors on multi-display setup
UE - AI Workflows - UI Systems - Slate - Jul 15, 2026When SetInputMode_GameOnly is applied on a PlayerController and the application runs in windowed mode on a multi-monitor setup, the Windows OS shortcut Win+Arrow (window snapping) stops functioning ...
VSM shadows are missing for non-Nanite meshes in a PPV where Megalights is disabled, but Megalights is enabled in the project
UE - Rendering - Features - Jul 14, 2026In UE 5.8 r.Visibility.LocalLightPrimitiveInteraction mode 2 (enabled if MegaLights is disabled) was added and made the new default as a performance optimization. However, this causes shadows to d ...
Can't cook a subsequent release when the project uses World Partition.
UE - Core - Data Pipeline - Cooker - Jul 14, 2026A licensee reported getting errors when cooking a subsequent release. The bug is a side effect of CL44557776 which changed the behavior when dealing with generated packages in UCookOnTheFlyServer::G ...
Deadlock while cooking groom bindings
UE - Runtime - Deformable - Jul 14, 2026Hi, we are experiencing random deadlocks while cooking groom bindings. We have integrated 5.8 mutable into 5.6 and are still experimenting those deadlocks which seem due to : UE_DEPRECATED(5.4, "Th ...
Cine Assembly - Cannot convert any bindings to spawnable
UE - CAPT - Tools - Shot Management - Jul 13, 2026You cannot change any binding type in bindings in Cinematic Assemblies, e.g., you cannot make something spawnable. ...