The editor is crashing when clicking the Maximize button on a standalone window when a startup movie is playing.
Result: Editor Crashes
Assertion failed: IsValid() [Link Removed] [Line: 824]
UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:349] UE4Editor_Engine!FSceneViewport::OnPostResizeWindowBackbuffer() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\engine\private\slate\sceneviewport.cpp:1677] UE4Editor_Engine!TBaseRawMethodDelegateInstance<0,FSceneViewport,void __cdecl(void * __ptr64)>::ExecuteIfSafe() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:648] UE4Editor_SlateRHIRenderer!TBaseMulticastDelegate<void,void * __ptr64>::Broadcast() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:937] UE4Editor_SlateRHIRenderer!FSlateRHIRenderer::ConditionalResizeViewport() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slaterhirenderer\private\slaterhirenderer.cpp:412] UE4Editor_SlateRHIRenderer!FSlateRHIRenderer::DrawWindows_Private() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slaterhirenderer\private\slaterhirenderer.cpp:1031] UE4Editor_Slate!FSlateApplication::PrivateDrawWindows() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1453] UE4Editor_Slate!FSlateApplication::DrawWindows() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1149] UE4Editor_Slate!FSlateApplication::TickApplication() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1726] UE4Editor_Slate!FSlateApplication::Tick() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1548] UE4Editor_MoviePlayer!FDefaultGameMoviePlayer::WaitForMovieToFinish() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\movieplayer\private\defaultgamemovieplayer.cpp:428] UE4Editor!FEngineLoop::Init() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2617] UE4Editor!GuardedMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launch.cpp:153] UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134] UE4Editor!WinMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210] UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264] kernel32 ntdll
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Head over to the existing Questions & Answers thread and let us know what's up.