Description

The editor is crashing when clicking the Maximize button on a standalone window when a startup movie is playing.

Steps to Reproduce
  1. Open the editor
  2. Import the attached folder
  3. Navigate to Project Settings->Movies and enabled Wait for Movies to Complete and Movies are Skipable
  4. Add the movie from the folder to Startup Movies
  5. Run in Standalone
  6. Maximize the window

Result: Editor Crashes

Callstack

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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Fixed
ComponentTools
Affects Versions4.15.14.164.17
Target Fix4.17
Fix Commit3521330
Main Commit3555226
Release Commit3521330
CreatedJun 2, 2017
ResolvedJul 5, 2017
UpdatedFeb 12, 2019