Hey Wazzdaka,
I just tested the Startup Movies in a new blank project using the Launch On option, and was able to see the movie as expected. Would you mind doing the same and testing this Test Video in a blank project?
Be sure you have enabled the ‘Wait for Movies to Complete’ option, as well as disabling the ‘Movies are Skippable’ option. There are some known compatibility issues with H264 encoded video types, so I would also try using a different encoded format.
Thanks,