OSX 14.5 (23F79)
2 external monitors plus laptop screen
The movie was playing, but I could not see it.
I minimized all other windows, and I could Cmd+Tab to it, but all I could see was a small sliver of black in the app preview, but when I switched to it, I would only see my desktops.
I had to force quit, restart, clear all data, and restart again.
Immediately after install, on first launch, movie should play.
Version 0.99.127.3-beta (WebKit 619.1.1)
Sonoma (14)