Game Movie Player: black screen when loading is finished

Development Programming & Scripting C++
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3

I fixed it by applying the following patch to the engine (5.0.3 source build). Seems like a bug to me!?

Index: Engine/Source/Runtime/MoviePlayer/Private/DefaultGameMoviePlayer.cpp
===================================================================
diff --git a/Engine/Source/Runtime/MoviePlayer/Private/DefaultGameMoviePlayer.cpp b/Engine/Source/Runtime/MoviePlayer/Private/DefaultGameMoviePlayer.cpp
--- a/Engine/Source/Runtime/MoviePlayer/Private/DefaultGameMoviePlayer.cpp	(revision 0b0bcb3adfabea95f9a061a430c0f7c5cbedf70c)
+++ b/Engine/Source/Runtime/MoviePlayer/Private/DefaultGameMoviePlayer.cpp	(date 1664976414824)
@@ -465,14 +465,7 @@
             // Transfer the content to the main window
             MainWindow.Pin()->SetContent(LoadingScreenContents.ToSharedRef());
         }
-        if (VirtualRenderWindow.IsValid())
-        {
-            VirtualRenderWindow->SetContent(SNullWidget::NullWidget);
-        }
-		if (UserWidgetHolder.IsValid())
-		{
-			UserWidgetHolder->SetContent(SNullWidget::NullWidget);
-		}
+        
 
 		const bool bAutoCompleteWhenLoadingCompletes = LoadingScreenAttributes.bAutoCompleteWhenLoadingCompletes;
 		const bool bWaitForManualStop = LoadingScreenAttributes.bWaitForManualStop;
@@ -572,6 +565,15 @@
 			}
 		}
 
+		if (VirtualRenderWindow.IsValid())
+		{
+			VirtualRenderWindow->SetContent(SNullWidget::NullWidget);
+		}
+		if (UserWidgetHolder.IsValid())
+		{
+			UserWidgetHolder->SetContent(SNullWidget::NullWidget);
+		}
+
 		LoadingIsDone.Set(1);
 		IsMoviePlaying = false;
 		FCoreDelegates::OnAsyncLoadingFlushUpdate.Remove(OnAsyncLoadingFlushUpdateDelegateHandle);