Unreal Engine Issues
Unreal Engine Issues
Building lighting fails on Linux
UE - Platform - Linux - Jan 15, 2016When building lighting on Linux, the build process fails because UnrealLightmass cannot find the library libUnrealLightmass-Serialization.so. Reported using Mint Cinnamon 17.3 Internal machine uses ...
OnRep functions do not fire on the client
UE - Networking - Mar 15, 2015OnRep functions do not fire on the client. Reproduced in 4.7.2 binary and Main (//depot/UE4/Promotable-CL-2478413) ...
World Position Offset invalidates Point Lights Entire Virtual Shadow Map Cache when light frustrum is only overlapping a small portion of the mesh
UE - Rendering - Graphics Features - Oct 22, 2025When adding a spotlight to the scene it does not correctly use cached virtual shadow map pages when the spotlight overlaps a mesh using WPO. This can be most easily observed by entering 'Cached Pag ...
UE4Editor is crashing after user builds lighting
UE - Graphics Features - Lumen - Jul 22, 2020Issue reported by user that they are experiencing consistent crashes in UE4Editor have building lighting. ...
Crash enabling Stochastic Rect Light with Ray Tracing
UE - Graphics Features - Lumen - Oct 13, 2020Enabling Stochastic Rect Lights with Ray Tracing causes the project to crash. Reported and tested in version 4.26.0(CL 14419252). Tested and not found in version 4.25.3(CL 13942748). ...
ActorActionUtility / AssetActionUtility does NOT properly work if function has struct paramter
Tools - May 21, 2019ActorActionUtility / AssetActionUtility use SStructureDetailsView to show dialog for editing function's parameter ( FBlutilityMenuExtensions::CreateBlutilityActionsMenu ). But SStructureDetailsVi ...
No Set function for TextRenderComponent::VerticalAlignment variable
UE - Graphics Features - May 25, 2016There is no set function for the vertical alignment variable in TextRenderComponent.h meaning the variable must be set directly. This is inconsistent since there is the SetHorizontalAlignment() fun ...
Crash when calling a RPC function with a TSet or TMap parameter on a client
UE - Networking - May 11, 2018Calling a RPC function with a TSet or TMap parameter on a client causes the editor to crash. Regression?: No This also occurs in 4.18 ...
Mover plugin: Crash on UFloorQueryUtils::ComputeFloorDist() and other utility functions that assume the pawn uses a UCapsuleComponent
UE - Gameplay - Player Movement - Mover - Dec 4, 2025The following functions have been found to perform unchecked casts of the pawn's "UpdatedComponent" to class UCapsuleComponent, possibly resulting in crashes:UFloorQueryUtils::ComputeFloorDist()UGro ...
A point light's source length appears to be 0 if too many are on screen at once
UE - Graphics Features - Feb 15, 2016If a user places too many point lights on screen at once with a source length greater than 0 it will appear as though the length is 0 ...