Unreal Engine Issues
Unreal Engine Issues
Changing MaterialQualityLevel causes a crash due to a ShaderMap mismatch in UniformExpressionCache
UE - Rendering Architecture - Materials - Nov 26, 2025A crash may occur when changing the MaterialQualitylevel via Scalability due to a race condition. The issue occurs because in ScalabilityCVarsSinkCallback(), when it creates the FGlobalComponentRec ...
A duplicated component in the blueprint editor is invisible and the pivot stays at 0,0,0 until compiled
UE - Gameplay - Blueprint - Jun 19, 2015A duplicated component in the blueprint editor is invisible and the pivot stays at 0,0,0 until compiled User Description: Since 4.8 if I duplicate a child actor component in the viewport the dupli ...
Sounds Triggered on Android playback 3 times in quick Succession
UE - Audio - Oct 1, 2015Users are reporting that when playing sounds in projects deployed to their Android Devices, the playback is triggered three times in quick succession. There are known work arounds to this issue, li ...
A Child PlayerCharacter BP in this project resets its assigned Anim BP to 'None' on restarting the project
UE - Gameplay - Blueprint - Jul 16, 2015A Child PlayerCharacter BP in this project resets its assigned Anim BP to 'None' on restarting the project. The user reports that the Skeletal Mesh will also occasionally reset to None. I have not b ...
Cones for angular constraints not visible is Separate Translucency is disabled
UE - Graphics Features - Apr 14, 2016A user reported an issue where the cones that represent angular constraints in the PHAT editor are not rendered if Separate Translucency is disabled. This may be related to another issue with Separa ...
Re-importing an FBX with embedded media will not update the textures
UE - Editor - Content Pipeline - Import and Export - Nov 4, 2014BRANCH: MAIN CHANGELIST: 2323471 PLATFORM: Windows DESCRIPTION: Creating an FBX with media embedded and later overwriting that FBX with a new file that updates the material and the mesh, only the ...
Undoing pasting a component will crash ([CrashReport] UE4Editor_CoreUObject!FWeakObjectPtr::IsValid() [weakobjectptr.cpp:48])
UE - Gameplay - Components - Jul 20, 2017This is a common crash affecting users in 4.16. The callstack is similar to [Link Removed], which was fixed in 4.13. User DescriptionsAccidentally duplicated a blueprint with multiple static mesh ...
Net Cull Distance does not work with Pawn only Character
UE - Gameplay - Player Movement - May 4, 2015Licensee also posted on Asnwerhub here, https://answers.unrealengine.com/questions/220787/bug-net-cull-distance-doesnt-work-when-the-player.html Also Reproduced in Main Promotable-CL-2535351 & Rele ...
[CrashReport] UE4Editor_Kismet!FQuatRotationMatrix::FQuatRotationMatrix() [quatrotationtranslationmatrix.h:43]
UE - Gameplay - Aug 31, 2018User comment in crash group:Please Contact me to help fix this. I don't know what else to do. 41 FQuatRotationMatrix(const FQuat& Q) 42 ***** : FQuatRotationTranslationMatrix(Q, FVect ...
Push based fast array with net.PushModelSkipUndirtiedFastArrays not replicating across multiple PIE sessions
UE - Networking - Sep 19, 2022The conditions for this bug are fairly specific. The actor must be statically placed, with its only replicated property being the fast array, and net.PushModelSkipUndirtiedFastArrays must be enabled ...