Unreal Engine Issues
Unreal Engine Issues
iOS Show External Login UI Blueprint Node fails on new iOS devices
UE - Online - Jun 6, 2019I have been trying to test iOS online subsystem functionality for my game and thought that this blueprint node was just broken. This bug will probably catch many UE4 developers that are new to iOS b ...
BlendSpace DeltaTimeRecord.Delta can incorrectly be set to zero
UE - Anim - Runtime - Apr 19, 2024It's possible for blendspaces to end up with an invalid delta time record because of how UBlendSpace::TickAssetPlayer modifies the time record. This only seems to happen with specific settings:Axis ...
Tick functions are skipped on the first frame in package build and standalone PIE
UE - Gameplay - May 19, 2025It's reported that all Tick functions are skipped on the first frame when running in packaged builds and standalone PIE. This is because both TickVisitedGFrameCounter and GFrameCounter are initializ ...
Reversed Animations don't play properly using Skeletal Mesh Pose and animations with Keep State in Sequencer
UE - Anim - Sequencer - Nov 26, 2018The bug seems to only reproduce when setting animations in sequencer and only if the animations are set to "Keep state". Setting them to "restore default" makes the reversed animation play correctly ...
CookAdditionalFilesOverride Context struct
UE - Foundation - Data Pipeline - Cooker - Sep 23, 2022virtual void UObject::CookAdditionalFilesOverride allows non-package files to be copied or created during the cook whenever a UObject of your class is in a package that is cooked. This is useful for ...
[CrashReport] UE4Editor-D3D11RHI!static void TerminateOnDeviceRemoved(HRESULT, struct ID3D11Device *) [D3D11Util.cpp:160]
UE - Rendering Architecture - RHI - May 6, 2020This ticket tracks instances of D3DHung crashes now that Aftermath has been enabled in 4.25.0. [Link Removed] was marked fixed and closed with the enabling of Aftermath. Error Messages: Fatal err ...
Cook Determinism - Construction Scripts and ChildActorComponent issues with DiffCooks
UE - Framework - Components - Jul 26, 2024To step through the issue, in the -DiffOnly cook add a breakpoint to UChildActorComponent::OnRegister and UChildActorComponent::OnUnregister. It should hit 4 times:Once when LoadPackage loads the ma ...
FMultiReaderSingleWriterGT isn't thread safe
UE - Foundation - Core - May 17, 2016From https://udn.unrealengine.com/questions/292741/fmultireadersinglewritergt-isnt-thread-safe.html: I've found that FMultiReaderSingleWriterGT has at least 2 bugs: The one that caused a deadlock ...
ShooterGame references images in slate from a folder that does not exist
Docs - Samples - Jul 8, 2015A user has found that there are a few lines of code inside of shooter game that references a folder that does not exist. The lines of code below are the lines of code that reference images in an ima ...
[CrashReport] Access violation in UE4Editor_Engine!FDistanceFieldAsyncQueue::ProcessAsyncTasks()
UE - Graphics Features - May 31, 2017This report has been logged due to a high volume of submitted crash reports. Additional information is currently unknown. User descriptionsDeleted 3 rocks from mesh folder and accepted to delete e ...