Unreal Studio: Multi User Viewer Template Menu: Next Arrow Bug

"There's a bug with the menu where you cant get to the next step (server browser or host) when you have a VR headset plugged and available. The "Next_Btn" button is greyed out on the last step. You can still go through by clicking back to the "Display Name" textfield and press the Enter key.

It works as intended when you don't have one as it skips the Desktop/VR selection step."

I was able to reproduce the next arrow being greyed out and fixed it by removing the next button animation in UMG. This fixes it for a packaged game but there is a crash in editor during PIE or by scrubbing the "AnimMenuStep2" anim in the Main Menu UMG.

Prerequisite: Plug in VR headset 

1. Package Multi-User Project
2. Enter Name and Select Platform

Result: Arrow is greyed out next to Host/Join session dropdown

Workaround: Select name box and press enter.

UPDATE:

Looks to be a bud with the UMG animation which seems to use the sequencer code.

I was able to reproduce the next arrow being greyed out and fixed it by removing the next button animation in UMG. This fixes it for a packaged game but there is a crash in editor during PIE or by scrubbing the "AnimMenuStep2" anim in the Main Menu UMG.

Repro Steps:

• Install Unreal 4.21 Preview 1
• Create a new Unreal Studio MultiUserViewer Template
• Open "Widget_MainMenu" in the UMG sub folder
• Select the "AnimMenuStep2" anim
• Scrub to the last frame of the anim
• Alternatively, Open the MainMenu map, play in editor with VR headset connected, enter name, press next arrow until the Host a Session menu appears and the game will crash.

Assertion failed: MovieScene::DiscreteRangesOverlap(CurrentRange, CompareRange) [Link Removed] [Line: 88]

UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:422]
UE4Editor_MovieScene!FMovieSceneEvaluationTreeRangeIterator::FMovieSceneEvaluationTreeRangeIterator() [d:\build\++ue4\sync\engine\source\runtime\moviescene\private\evaluation\moviesceneevaluationtree.cpp:89]
UE4Editor_MovieScene!FMovieSceneCompiler::CompileRange() [d:\build\++ue4\sync\engine\source\runtime\moviescene\private\compilation\moviescenecompiler.cpp:262]
UE4Editor_MovieScene!FMovieSceneEvaluationField::ConditionallyCompileRange() [d:\build\++ue4\sync\engine\source\runtime\moviescene\private\evaluation\moviesceneevaluationfield.cpp:89]
UE4Editor_MovieScene!FMovieSceneRootEvaluationTemplateInstance::SetupFrame() [d:\build\++ue4\sync\engine\source\runtime\moviescene\private\evaluation\moviesceneevaluationtemplateinstance.cpp:317]
UE4Editor_MovieScene!FMovieSceneRootEvaluationTemplateInstance::Evaluate() [d:\build\++ue4\sync\engine\source\runtime\moviescene\private\evaluation\moviesceneevaluationtemplateinstance.cpp:229]
UE4Editor_UMG!UUMGSequencePlayer::Tick() [d:\build\++ue4\sync\engine\source\runtime\umg\private\animation\umgsequenceplayer.cpp:118]
UE4Editor_UMG!UUserWidget::TickActionsAndAnimation() [d:\build\++ue4\sync\engine\source\runtime\umg\private\userwidget.cpp:1419]
UE4Editor_UMG!UUserWidget::NativeTick() [d:\build\++ue4\sync\engine\source\runtime\umg\private\userwidget.cpp:1400]
UE4Editor_UMG!SObjectWidget::Tick() [d:\build\++ue4\sync\engine\source\runtime\umg\private\slate\sobjectwidget.cpp:106]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1003]
UE4Editor_Slate!SConstraintCanvas::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slate\private\widgets\layout\sconstraintcanvas.cpp:223]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_SlateCore!SOverlay::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\soverlay.cpp:95]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_SlateCore!SOverlay::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\soverlay.cpp:95]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:31]
UE4Editor_SlateCore!SPanel::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:12]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:31]
UE4Editor_SlateCore!SPanel::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:12]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:35]
UE4Editor_Engine!SGameLayerManager::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\engine\private\slate\sgamelayermanager.cpp:255]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:35]
UE4Editor_Slate!SViewport::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slate\private\widgets\sviewport.cpp:128]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:35]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:31]
UE4Editor_SlateCore!SPanel::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:12]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:31]
UE4Editor_SlateCore!SPanel::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:12]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_SlateCore!SOverlay::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\soverlay.cpp:95]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:35]
UE4Editor_SlateCore!SWindow::OnPaint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swindow.cpp:1927]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:1037]
UE4Editor_Slate!FSlateApplication::DrawWindowAndChildren() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1321]
UE4Editor_Slate!FSlateApplication::PrivateDrawWindows() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1576]
UE4Editor_Slate!FSlateApplication::DrawWindows() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1278]
UE4Editor_Slate!FSlateApplication::TickApplication() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1861]
UE4Editor_Slate!FSlateApplication::Tick() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1692]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3794]
UE4Editor!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:174]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:145]
UE4Editor!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:276]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283]
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