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 Canât run sequener_anim_examples.py due to indentation error
UE-108315 FCPXML export is off by one frame
UE-108622 Copy and paste doesnât work when pasting into the transfrom track
UE-108706 Not all components are being recorded
UE-108625 Thare are some case in which KeepState doesnât 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 doesnât 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 Donât blend.
UE-109550 MovieSceneSequenceTickManager can get GCâd unexpectedly in 4.26
UE-109519 Donât 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 doesnât 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 Canât 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 ââ
UE-111390 AspectRatioAxisConstraint changes in 4.26
UE-111385 Control rig channels arenât 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 doesnât support {date} format tag
UE-107887 Sequencer scripting SetDefault should modify
UE-110581 OSC - String read appends extra â\0â
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 âQA -Promotionâ
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 âLabelâ 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. âThe project could not be compiled. Would you like to open it in Visual Studio?â
UE-109011 GitHub 7782 : Removed excessive quotes from VSCode project argument
UE-109222 Incorrect makefile invalidation
UE-43456 The âReset to defaultâ 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 nodeâs 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] libUE4Editor-ApplicationCore.so!X11_SetWindowPosition [SDL_x11window.c:863]
UE-109123 LinuxAArch64 fails to link when including
UE-109095 [CrashReport] libUE4Editor-UnrealEd.so!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 doesnât 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-108458 DXGI_ERROR_INVALID_CALL log spam
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 âFreeâ 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 doesnât 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 Canât 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 - âFix ExeFlagsâ 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