4.26.2 Hotfix Released

The 4.26.2 Hotfix is now live! This hotfix resolves over 200 issues in the 4.26 release.

Feel free to discuss this release on the 4.26 Forum thread.

If you experience a bug with the 4.26.2 Hotfix, please follow the How to Report a Bug guide to report it on the Bug Submission Form.

Fixed in 4.26.2

UE-107681 Not allow Multi-Select of non animatable controls for Control Rig

UE-108311 Focus Controls and Spaces in Control Rig Editor

UE-108023 Renaming spaces that have children does not rename graph nodes referencing the space

UE-109476 Crash when copy/paste meerkat spine rig to eagle

UE-110210 Control Rig explodes when moving controls, unable to reset

UE-108549 [CrashReport] UE4Editor-Slate!FSlateApplication::OnMouseUp(EMouseButtons::Type,FVector2D) [SlateApplication.cpp:5321]

UE-107564 SAnimCurveViewer very slow with lots of curves

UE-107627 Issues with interactions between predicted LOD level clamping and mesh visibility

UE-110678 [CrashReport] AssetToReopen [File:D:/Build/++UE4/Sync/Engine/Source/Editor/Persona/Private/PersonaToolkit.cpp]

UE-110704 [CrashReport] UE4Editor-Engine!DispatchCheckVerify<void,<lambda_e0243372f44d732a09d4cb9858c4d261> >(<lambda_e0243372f44d732a09d4cb9858c4d261> &&) [AssertionMacros.h:165]

UE-110865 Split pins on nodes within sub-graphs in an animation blueprint are broken

UE-106495 [CrashReport]: UE4Editor-Renderer!FDeferredShadingSceneRenderer::FDeferredShadingSceneRenderer

UE-106914 Failure to add key and potential crash when adding keyframe to sequence through details panel

UE-107477 Removing a transform track from the sequencer will no longer clean up spawnable actor when the sequencer is closed

UE-106939 Add a warning that Sequence Recorder will be removed in the future

UE-107561 MoviePipeline: bOwnerNoSee is not respected

UE-107573 Pasting a section always adds a row regardless if there is space for the section on the current row

UE-107306 Editor crash when modifying Skeletal Animation Section of an unsaved additive animation

UE-106262 Lighting missing in rendered shot when previous shot is rendered as part of same pass

UE-106483 [CrashReporter] UE4Editor-MovieRenderPipelineRenderPasses!UMoviePipelineImagePassBase::CalculateViewFamily(FMoviePipelineRenderPassMetrics &) [MoviePipelineImagePassBase.cpp:67]

UE-107669 Sequencer: Control Rig: Moving gizmo in viewport loses Sequencer selection

UE-106194 FFT filters in sequencer curve editor shoot curves way off from their original plotted locaiton

UE-106948 Sequence with null skeletal track sections crashes on load

UE-107508 [CrashReport] UE4Editor-MovieScene!FMovieSceneEntitySystemRunner::Update(FMovieSceneContext const &,UE::MovieScene::FInstanceHandle) [MovieSceneEntitySystemRunner.cpp:96]

UE-107862 Infinite Camera Shake oscillation does not playback correctly in Sequencer

UE-107756 Adding an actor to a template sequence and trying to animate it causes crash

UE-108021 Sequencer curve editor curve colors are difficult to read

UE-107896 Can not export sequencer from command line when use Movie Render Queue

UE-108054 [CrashReport] UE4Editor-Sequencer!FSequencer::ZoomToFit() [Sequencer.cpp:6847]

UE-107747 Changing light samples per pixel in details pane with track in sequencer accumulates value incorrectly

UE-108139 Using Select Objects in Sequencer Scripting only selects one object

UE-107856 Set view range scripting functions will not update timeline UI

UE-108356 Can’t run due to indentation error

UE-108315 FCPXML export is off by one frame

UE-108622 Copy and paste doesn’t work when pasting into the transfrom track

UE-108706 Not all components are being recorded

UE-108625 Thare are some case in which KeepState doesn’t work propely if level sequence have multiple Shot and Transform Tracks

UE-97014 Sequencer Update problem with Control Rig when navigating in the level leading to losing poses

UE-108686 Sequencer: Root Motion query needs to set a MemMark before getting compact poses

UE-108796 Nosound UGS cvar crashes MRQ sequencer render on startup

UE-108733 Crash when playing a other Level Sequence inside a Spawnable Actor registered with Level Sequence

UE-108981 Undo keys all channels in Sequencer when using Key Group or Key All

UE-108238 Undoing a curve editor change removes current selection

UE-108996 Template sequence track doesn’t allow adding correct compatible template sequences

UE-108995 Movie render crashes editor if sequence contains a template sequence

UE-108361 Selection remaining and hitch when selection control in Curve Editor after selecting parent control rig track in Sequencer

UE-108359 Control Rig Selection between Viewport, Sequencer and Curve Editor is in consistent

UE-109279 Marquee Selecting Controls in Orthographic View causes Crash

UE-109275 Sequencer: Control Rig: Additive Sections Overwrite And Don’t blend.

UE-109550 MovieSceneSequenceTickManager can get GC’d unexpectedly in 4.26

UE-109519 Don’t invaliate viewport on tick.

UE-109491 GitHub 7794 : Remove copy assignment of several const reference variables in Sequencer code

UE-107121 [CrashReport] UE4Editor-MovieRenderPipelineCore!UMoviePipelineHighResSetting::GetFooterText(UMoviePipelineExecutorJob *) [MoviePipelineHighResSetting.h:94]

UE-100792 ObjectIdPass doesn’t work when Stencil Layers are used

UE-109673 Specific Character crashes when the recording is starting - \MovieSceneTracks\Private\Tracks\MovieSceneSkeletalAnimationTrack.cpp:542]

UE-109920 Sequencer - convert to spawnable causes any unkeyed additive anim tracks to double in value or compound somehow

UE-109391 MoviePipeline: Use Camera Cut for Warmup creates incorrect Camera Motion Blur

UE-110102 Sequencer Copy Paste Bug

UE-104118 Actors with multiple Control Rig Components only have 1 Control Rig track in Sequencer

UE-108509 Can’t preview correctly when using Lookat Track with [Can Blend] enabled

UE-110637 Ensure when right clicking on a camera cut track with multiple sections

UE-110250 Take Recorder crashes if actor with animation despawns during recording

UE-110687 UE4Editor-MovieRenderPipelineCore!UMoviePipelineExecutorBase::Execute(UMoviePipelineQueue *) [MoviePipelineExecutor.gen.cpp:361]

UE-109640 MRQ - Apple ProRes 4444 - Alpha channel is inverted

UE-110594 MoviePipeline: Crash when using AppleProRes codec and a output directory with a “”

UE-111390 AspectRatioAxisConstraint changes in 4.26

UE-111385 Control rig channels aren’t getting reconstructed properly

UE-111562 Correct exponential algorithm in FSequencerNodeTree::UpdateFilters()

UE-111396 Crash in CheckCanChangeStructure when playing a sequence in editor

UE-111581 MoviePipeline: Apple ProRes codec doesn’t support {date} format tag

UE-107887 Sequencer scripting SetDefault should modify

UE-110581 OSC - String read appends extra ‘\0’

UE-108494 UE.EditorAutomation does not pass nullrhi to editor process

UE-78732 Mac RunUnreal -test=ElementalDemoTest does not find Archived Build

UE-73286 RunUnreal -map=QA-Promotion produces a command line with “QA -Promotion”

UE-111857 Fails to run UE4Game through Gauntlet automation when targeting Android

UE-107733 [CrashReport] UE4Editor_Core!FArchive::SerializeCompressed()

UE-107567 The LoadTimeFile argument crashes package at startup

UE-110520 Diagnostics.Session2 is missing important build information.

UE-102630 macOS Big Sur - CrashReporter window sometimes does not launch on consecutive crashes

UE-104996 [Crash Report] DuplicateSelectedActors::FDuplicateJob::DuplicateActorsToLevel(TArray<AActor *,TSizedDefaultAllocator<32> > &,ULevel *,bool) [EditorActor.cpp:433]

UE-108310 The engine crashes on startup after adding a struct with AddReferencedObjects function and placing it in a static array on another class

UE-107635 BuildGraph requires “Label” nodes to be in the root of the graph

UE-107639 BuildGraph does not provide a way to check if a token exists in a string

UE-108939 GitHub 7780 : Linux support in Rider project configuration.

UE-107751 Version code in UBT does not correctly detect minor toolchain bumps

UE-107584 Warnings in ActionHistory.cs Can Rarely Cause CI Build Failures

UE-108609 Editor fails to create code projects. “The project could not be compiled. Would you like to open it in Visual Studio?”

UE-109011 GitHub 7782 : Removed excessive quotes from VSCode project argument

UE-109222 Incorrect makefile invalidation

UE-43456 The “Reset to default” button appears erroneously in the Blueprint editor Details panel (Class Defaults) for instanced subobjects

UE-107794 GitHub 7741 : Fix possible blueprint crash in CableComponent::SetAttachEndToComponent

UE-108372 Crash spawning child blueprint after removing entry from instanced array

UE-109038 Reparenting creates incorrect ICH nodes

UE-108222 Soft actor references can no longer be set in DataTables

UE-108973 Some blueprint nodes are noticeably wider

UE-110694 [CrashReport] UE4Editor-Kismet!SFixupSelfContextDialog::CloseWindow(bool) [SFixupSelfContextDlg.cpp:199]

UE-110877 Bound component functions in a child can incorrectly override parent binding

UE-111557 The Get Class Default node’s Hide Unconnected Pins option no longer hides the appropriate pins

UE-111353 Hide unconnected pins not working for GetClassDefaults node.

UE-104711 Crash applying instance changes to blueprint while a child blueprint with different properties is also in the level

UE-107271 GitHub 7715 : Update PlayerInput.cpp

UE-109812 Video does not loop correctly in ElectraPlayer

UE-110377 Http Server closes connections too quickly after they are established

UE-91178 Logic Error in FHttpPath::IsValidPath()

UE-101163 Game Center Leaderboards not displaying information on some iOS devices

UE-105470 Incorrect Resource Usage/Missing Barriers for Virtual Textures

UE-103235 Assertion failed: FoundTexture->Flags == Flags looking towards the back of TM-VRSmoke

UE-106085 [CrashReport]!X11_SetWindowPosition [SDL_x11window.c:863]

UE-109123 LinuxAArch64 fails to link when including

UE-109095 [CrashReport]!UCookOnTheFlyServer::BeginPackageCacheForCookedPlatformData(UE::Cook::FPackageData&, UE::Cook::FCookerTimer&) [CookOnTheFlyServer.cpp:1901]

UE-110161 Xcode 12.4 failed to compile editor when bEnableThreadSanitizer=true

UE-107757 iOS binaries have the architecture name appended when building via Xcode

UE-103497 Runtime Virtual Texture crash in es31 editor preview

UE-110644 Unnecessary Gradle steps runs when UE4CommandLine.txt or AndroidManifest.xml doesn’t change

UE-110880 CSM disappeared if enable spotlight shadow on ES31

UE-107897 Slower Cache Uniform Expression in 4.26 compare with 4.24

UE-107898 Artifact caused by material Fresnel node


UE-106501 [CrashReport] UE4Editor-Renderer!FHeightfieldLightingViewInfo::CompositeHeightfieldsIntoGlobalDistanceField

UE-107228 Crash and visual artifact with fullscreen DBuffer decals in forward shading mode.

UE-106127 Groom renders black after cast shadow is disabled

UE-90851 SceneCaptureCube does not work for FinalColor

UE-106137 Groom is not affected by interpolation changes made in groom editor

UE-106319 crashed when load groom asset with Automate property

UE-107672 Linux - Crash when moving/turning the viewport camera in project that contains hair

UE-109689 Motionblur displays harsh cutoff in 4.26

UE-109296 Motion Blur artifact when no objects are moving

UE-109048 Crash converting Car Configurator Sample Project textures to Virtual Textures

UE-110256 Crash when setting SSAO Quality to 0

UE-108524 [CrashReport] UE4Editor-HairStrandsCore!static void RunInternalHairStrandsInterpolation(class FRDGBuilder & const, const class FSceneView *, EWorldType::Type, const class FGPUSkinCache *, const struct FShaderDrawDebugData *, class FGlobalShaderMap *

UE-109532 Crash loading niagara assets when -noshadercompile is specified

UE-110330 Virtual Bones Crash CPU Emitters

UE-110518 Occlusion Query does not take screen perspective into account

UE-104355 Major CPU performance regression in FLandscapeComponentSceneProxy::GetDynamicRayTracingInstances

UE-94090 [CrashReport]FPrecomputedVolumetricLightmapData::RemoveFromSceneData(FPrecomputedVolumetricLightmapData *,int) [PrecomputedVolumetricLightmap.cpp:653]

UE-103341 Visual discrepancy between VK and D3D(11,12) on Windows with an HDR output monitor

UE-106385 RHICopyTexture fails to copy from R16G16 to BC1

UE-106490 [CrashReport] Assertion failed: SizeX <= GetMax2DTextureDimension() [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/D3D12RHI/Private/D3D12Texture.cpp] [Line: 714]

UE-109910 Regression in editor performance in D3D11

UE-109676 QAGame does not shut down when it is closed

UE-109816 Headless Chaos fails to build when PhysX is the default physics engine.

UE-109380 All ELinearConstraintMotion pins in BP reset to “Free” when converting a project to 4.26

UE-106995 Assert when right-clicking a version in the source control File History dialog

UE-107553 Huge memory usage spike when spawning actors in loop through BP

UE-108328 Editor Viewport Resize Very Slow in 4.26 compared to 4.25.3

UE-110289 [CrashReport]UE4Editor-AssetTools!UAssetToolsImpl::AdvancedCopyPackages(TMap<FString,FString,FDefaultSetAllocator,TDefaultMapHashableKeyFuncs<FString,FString,0> > const &,bool,bool) [AssetTools.cpp:934]

UE-105008 [CrashReport] FTickTaskLevel::QueueAllTicks() [TickTaskManager.cpp:978]

UE-111689 Variant Manager - Crash switching variants.

UE-106064 [CrashReport] SAssetView::AssetVerifyRenameCommit(TSharedPtr<FAssetViewItem,0> const &,FText const &,FSlateRect const &,FText &) [SAssetView.cpp:3495]

UE-107591 Save asset dialog doesn’t update correctly

UE-107273 Error synchronizing Revit to UE DirectLink

UE-107752 Error synchronizing Revit to UE with DirectLink

UE-108599 DatasmithRhinoExporter - Memory leak causing crash when exporting large number of meshes

UE-107968 [Regression] Revit families exported with too many actors / components compared to 4.25

UE-109128 Missing instances of linked Revit scenes with Datasmith exporter and Direct Link

UE-110151 GitHub 7820 : Make sure ExtraTexturePaths contain only absolute paths.

UE-102409 DirectLink - Datasmith Revit 2020 Exporter - Missing parts of multi-story stairs

UE-109376 Wrong Transform on some entities with Direct Link sync from 4.27 exporters

UE-110717 [CrashReport] UE4Editor-StaticMeshEditorExtension!UUVGenerationFlattenMapping::GetOverlappingCornersRemapping(FMeshDescription const &,bool) [UVGenerationFlattenMapping.cpp:1344]

UE-108654 Lights are displaced when importing from Rhino into UE

UE-106061 [CrashReport] UE4Editor-UnrealEd!FEditorModeTools::DeactivateScriptableModeAtIndex(int) [EditorModeManager.cpp:594]

UE-106063 [CrashReport] UE4Editor-FoliageEdit!FEdModeFoliage::Exit() [FoliageEdMode.cpp:488]

UE-109149 Persistent level containing sublevels with HLODS invalidate after saving.

UE-107261 GitHub 7714 : Fix Factory ScriptFactoryCreateFile always failing to create asset.

UE-108919 Importing a FBX containing a material without a name can generate a bad material asset.

UE-109000 USD importer crashes editor: asset import failed on polygonVertexCount

UE-110235 USD - Wrong scene hierarchy

UE-110343 RGBA16 textures export to TGA files inverse the Red and Blue channel.

UE-110693 [CrashReport]UE4Editor-UnrealEd!UnFbx::GetImportOptions(UnFbx::FFbxImporter *,UFbxImportUI *,bool,bool,FString const &,bool &,bool &,bool,FString const &,bool,EFBXImportType) [FbxMainImport.cpp:189]

UE-110633 Reimporting SkeletalMesh with LODs generated via reduction tool crashes when reduction plugin is disabled

UE-109010 Crash when re importing groom when instantiated in Level

UE-111429 GitHub 7845 : Fix can?t import three bone animations one time

UE-108053 [CrashReport] UE4Editor-LandscapeEditor!FLandscapeToolSplines::HandleClick(HHitProxy *,FViewportClick const &) [LandscapeEdModeSplineTools.cpp:1055]

UE-107521 [CrashReport] UE4Editor-LandscapeEditor!FLandscapeEditorCustomNodeBuilder_Layers::FillClearPaintLayerMenu(FMenuBuilder &,int,TArray<ULandscapeLayerInfoObject *,TSizedDefaultAllocator<32> >) [LandscapeEditorDetailCustomization_Layers.cpp:375]

UE-97054 [CrashReport] UE4Editor-Landscape!ALandscape::PrepareComponentDataToExtractMaterialLayersCS

UE-110989 [CrashReport] UE4Editor-GraphEditor!SGraphNodeMaterialComment::MoveTo(FVector2D const &,TSet<TWeakPtrSNodePanel::SNode,0,DefaultKeyFuncs<TWeakPtrSNodePanel::SNode,0,0>,FDefaultSetAllocator> &) [SGraphNodeMaterialComment.cpp:20]

UE-107745 Python interpreter does not run in thread-safe mode

UE-107108 Adding a widget to a grid panel inside the grid panel tick can cause an out-of-bounds error

UE-107272 GitHub 7716 : Update SCheckBox.cpp

UE-107123 [CrashReporter] UE4Editor-UMGEditor!SHierarchyView::OnKeyDown(FGeometry const &,FKeyEvent const &) [SHierarchyView.cpp:146]

UE-107744 Nullptr deref crash using widget CachedElementData

UE-106334 UMG Animations on existing widgets break when loading new level

UE-103547 Ensure setting Widget Component TickMode to Disabled

UE-106974 Combobox navigation does not work consistently

UE-107139 Virtual Production Templates: Cvar r.TemporalAA.Upsampling in DefaultEngine.ini/Render Settings should be removed

UE-103050 TimeCode Synchronizer - Crash when open the Synchronization Window from a TimeCode Synchronizer asset - ngine\TimecodeProvider.h:90]

UE-107895 nDisplay is not able to process multiple unique cluster events per frame

UE-110050 Random crashes when cluster events are used

UE-110051 nDisplay configuratore preview is broken

UE-110052 Can’t load map with cluster events

UE-108263 Incorrect logic for custom present set

UE-110326 Remote Control API - Crash when remotely calling a python function that returns an array

UE-110859 Switchboard - SoundDevices plugin fails to trigger recording

UE-108828 Switchboard - Memory leak in listener

UE-110380 Switchboard - “Fix ExeFlags” not working on some PCs

UE-107912 Switchboard - Some nDisplay sync stats blank on non-Quadro cards

UE-107267 Virtualcamera2actor Always Adds UI to the Viewport in PIE

UE-110286 [CrashReport]UE4Editor-VCamCore!UVCamOutputRemoteSession::DestroyRemoteSession() [VCamOutputRemoteSession.cpp:167]

UE-111781 VCam - Using latest Unreal Remote with Unreal 4.25 and earlier will sometimes result in no image being shown

UE-109936 Vcam - No Option in UnrealRemote 2 application to edit the LiveLink Subject Name for Multi-Cam

UE-81971 Get Tracking State does not change in ARCore

UE-103459 Media Framework Appears White in TM-Shadermodels on Lumin

UE-108918 PSVR Rendering is jittery, uncomfortable, with TRC warning message about not enough flips/second

UE-111398 Quad stereo is rendering black in the additional views with ISR