So I use iTunes 10.6.3 (why is irrelevant) to download movies and TV shows from the store. Sometime within the last few months, it stopped being able to download or even playback 1080p videos. 720p and all other parts of the app continue to work just fine. I've installed this version on 10.6.8, 10.7.5, 10.8.5, and 10.9.5 with the same results. Regardless of the settings, it will only download 720p and if I import a 1080p video downloaded with a newer version (11.x) and authenticate, it's just a black screen (but imported 720p has no issues). This used to work without issue until something happened and it doesn't seem to be on my end as far as I can tell. Anyone know something I don't?