I just switched from UE 4.25.4 to UE 4.26.1. Whenever I try opening a static mesh in the editor, it freezes at either 25% or 100% and Unreal crashes.
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Assertion failed: IsValid() [File:D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Templates/SharedPointer.h] [Line: 824]
UE4Editor_Core!AssertFailedImplV() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:104]
UE4Editor_Core!FDebug::CheckVerifyFailedImpl() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:461]
UE4Editor_StaticMeshEditor!FStaticMeshEditor::SpawnTab_PreviewSceneSettings() [D:\Build++UE4\Sync\Engine\Source\Editor\StaticMeshEditor\Private\StaticMeshEditor.cpp:541]
UE4Editor_StaticMeshEditor!TBaseSPMethodDelegateInstance<0,FStaticMeshEditor,0,TSharedRef<SDockTab,0> __cdecl(FSpawnTabArgs const &),FDefaultDelegateUserPolicy>::Execute() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290]
UE4Editor_Slate!FTabManager::SpawnTab() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Docking\TabManager.cpp:1708]
UE4Editor_Slate!FTabManager::RestoreArea_Helper() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Docking\TabManager.cpp:1445]
UE4Editor_Slate!FTabManager::RestoreSplitterContent() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Docking\TabManager.cpp:1637]
UE4Editor_Slate!FTabManager::RestoreArea_Helper() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Docking\TabManager.cpp:1576]
UE4Editor_Slate!FTabManager::RestoreSplitterContent() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Docking\TabManager.cpp:1637]
UE4Editor_Slate!FTabManager::RestoreArea_Helper() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Docking\TabManager.cpp:1576]
UE4Editor_Slate!FTabManager::RestoreSplitterContent() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Docking\TabManager.cpp:1637]
UE4Editor_Slate!FTabManager::RestoreArea_Helper() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Docking\TabManager.cpp:1555]
UE4Editor_Slate!FTabManager::RestoreArea() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Docking\TabManager.cpp:1382]
UE4Editor_Slate!FTabManager::RestoreFrom() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Docking\TabManager.cpp:865]
UE4Editor_UnrealEd!SStandaloneAssetEditorToolkitHost::RestoreFromLayout() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Toolkits\SStandaloneAssetEditorToolkitHost.cpp:135]
UE4Editor_UnrealEd!SStandaloneAssetEditorToolkitHost::SetupInitialContent() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Toolkits\SStandaloneAssetEditorToolkitHost.cpp:62]
UE4Editor_UnrealEd!FAssetEditorToolkit::InitAssetEditor() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Toolkits\AssetEditorToolkit.cpp:271]
UE4Editor_UnrealEd!FAssetEditorToolkit::InitAssetEditor() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Toolkits\AssetEditorToolkit.cpp:60]
UE4Editor_StaticMeshEditor!FStaticMeshEditor::InitStaticMeshEditor() [D:\Build++UE4\Sync\Engine\Source\Editor\StaticMeshEditor\Private\StaticMeshEditor.cpp:271]
UE4Editor_StaticMeshEditor!FStaticMeshEditorModule::CreateStaticMeshEditor() [D:\Build++UE4\Sync\Engine\Source\Editor\StaticMeshEditor\Private\StaticMeshEditorModule.cpp:51]
UE4Editor_AssetTools!FAssetTypeActions_StaticMesh::OpenAssetEditor() [D:\Build++UE4\Sync\Engine\Source\Developer\AssetTools\Private\AssetTypeActions\AssetTypeActions_StaticMesh.cpp:75]
UE4Editor_UnrealEd!UAssetEditorSubsystem::OpenEditorForAsset() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Subsystems\AssetEditorSubsystem.cpp:363]
UE4Editor_UnrealEd!UAssetEditorSubsystem::OpenEditorForAssets_Advanced() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Subsystems\AssetEditorSubsystem.cpp:437]
UE4Editor_UnrealEd!UAssetEditorSubsystem::OpenEditorForAssets() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Subsystems\AssetEditorSubsystem.cpp:553]
UE4Editor_ContentBrowserAssetDataSource!ContentBrowserAssetData::EditOrPreviewAssetFileItems() [D:\Build++UE4\Sync\Engine\Plugins\Editor\ContentBrowser\ContentBrowserAssetDataSource\Source\ContentBrowserAssetDataSource\Private\ContentBrowserAssetDataCore.cpp:287]
UE4Editor_ContentBrowserAssetDataSource!ContentBrowserAssetData::EditOrPreviewItems() [D:\Build++UE4\Sync\Engine\Plugins\Editor\ContentBrowser\ContentBrowserAssetDataSource\Source\ContentBrowserAssetDataSource\Private\ContentBrowserAssetDataCore.cpp:307]
UE4Editor_ContentBrowserAssetDataSource!UContentBrowserAssetDataSource::BulkEditItems() [D:\Build++UE4\Sync\Engine\Plugins\Editor\ContentBrowser\ContentBrowserAssetDataSource\Source\ContentBrowserAssetDataSource\Private\ContentBrowserAssetDataSource.cpp:932]
UE4Editor_ContentBrowser!SContentBrowser::OnItemsActivated() [D:\Build++UE4\Sync\Engine\Source\Editor\ContentBrowser\Private\SContentBrowser.cpp:2238]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SContentBrowser,0,void __cdecl(TArrayView<FContentBrowserItem const ,int>,enum EAssetTypeActivationMethod::Type),FDefaultDelegateUserPolicy>::Execute() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290]
UE4Editor_ContentBrowser!SAssetView::OnListMouseButtonDoubleClick() [D:\Build++UE4\Sync\Engine\Source\Editor\ContentBrowser\Private\SAssetView.cpp:3455]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SAssetView,0,void __cdecl(TSharedPtr<FAssetViewItem,0>),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:307]
UE4Editor_ContentBrowser!TDelegate<void __cdecl(TSharedPtr<FAssetViewItem,0>),FDefaultDelegateUserPolicy>::ExecuteIfBound<void,0>() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateSignatureImpl.inl:599]
UE4Editor_ContentBrowser!SListView<TSharedPtr<FAssetViewItem,0> >::Private_OnItemDoubleClicked() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Public\Widgets\Views\SListView.h:1074]
UE4Editor_ContentBrowser!STableRow<TSharedPtr<FAssetViewItem,0> >::OnMouseButtonDoubleClick() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Public\Widgets\Views\STableRow.h:458]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_2b5148752c2a272000c47b69ff14a42e> >() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:378]
UE4Editor_Slate!FSlateApplication::RoutePointerDoubleClickEvent() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5281]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDoubleClickEvent() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5268]
UE4Editor_Slate!FSlateApplication::OnMouseDoubleClick() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5231]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2178]
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2638]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1042]
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:874]
user32
user32
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130]
UE4Editor!FEngineLoop::Tick() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4748]
UE4Editor!GuardedMain() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
UE4Editor!GuardedMainWrapper() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
UE4Editor!WinMain() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
UE4Editor!__scrt_common_main_seh() [d:\agent_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll