Unreal Engine Issues
Unreal Engine Issues
Displaying Revision control history for a file ending in an "undo" of a revision can cause a crash
UE - Editor - Workflow Systems - Jun 18, 2024This crash is caused by how source control history is managed and shown. In this specific case the source control software is Perforce. As written in the repro steps, it can happen to any uasset tha ...
Ensure triggered in FBoundsCacheElement::GetValue when adding ISM instances in Construction Script
UE - AI - Oct 8, 2025An ensure is triggered in FBoundsCacheElement::GetValue when adding instances to an InstancedStaticMeshComponent inside a Blueprint’s Construction Script. This occurs when the ISM component is navig ...
iOS will not package or launch on Win 10 machine
UE - Platform - Mobile - Sep 23, 2015Launching or packaging for iOS does not work on our Windows 10 machine however we are able to package and launch onto iOS devices from Windows 7 machines. Using the File > Package > iOS option with ...
Self-Shadowing changes when click on and off an actor
UE - Graphics Features - Jun 19, 2015Given a Movable Light with a Movable Mesh with enabled Self Shadow Only, the mesh will not cast inset shadows (despite this option begin forced to true according to Tooltip) unless the mesh is selec ...
[CrashReport] UE4Editor_BlueprintGraph!BlueprintActionFilterImpl::IsEventUnimplementable() [blueprintactionfilter.cpp:588]
UE - Gameplay - Blueprint - Jun 1, 2016This crash has been reported through the 4.12 Previews and is continuing to occur in the 4.12.0 release. Additional information about this crash is not available at this time, however it may be the ...
ModularGameplay and other runtime plugins have wrong LoadingPhase
UE - Gameplay - Jun 30, 2022Plugins that provide blueprint-accessible libraries generally need to be set the PreDefault LoadingPhase so they can be properly loaded before game-specific data that loads early in the Default load ...
UV Flipping Mode Causes Stretching of Particles
UE - Niagara - Nov 17, 2017If "UVFlipping Mode" under Rendering on the Required node of an emitter is set to anything other than "None," the particles can become stretched and distorted. As a workaround, I have discovered th ...
LIVE: A Local Variable cannot have its type changed if another local variable with the same name in a different function is in use
UE - Gameplay - Blueprint - Nov 6, 2014Two local variables with the same name in two different functions still interact with each other in some way. This was reported in TTP 346132 and fixed in that case, but currently if a local variabl ...
Using ServerTravel from a map set as the Transition Map with Seamless Travel enabled in the Game Mode will crash the editor
UE - Gameplay - Mar 6, 2015Using ServerTravel from a map set as the Transition Map with Seamless Travel enabled in the Game Mode will crash the editor. Probably related to [Link Removed] Reproduced in 4.7.2 binary and Main ...
Crash When Assigning a Static Mesh to the "Sample Static Mesh" Module
UE - Niagara - Jun 28, 2018When assigning a static mesh to the "Sample Static Mesh" module, the engine will crash as soon as you select a mesh and click "Fix Now". If the mesh already has CPU access enabled it will crash as s ...