I just created a new blank project in UE 5.0.1 and moved the ContentExamples movie over. I’m also getting stuck on step 9! (Just a black square with audio when double-clicking on video in media player)
In this situation, it might be best to submit a bug report
This might be a wild goose chase : but opening the VirtualStudio’s .uproject file with a text editor to see what extra plugins might be enabled could help. Also try to spot and differences in media player settings/setup