iTunes gives this really strange error from time to time " This movie requires QuickTime, which is not supported by this version of iTunes"
When a) I have the most up to date version of iTunes, Mac O/S, QuickTime, etc... and b) I already rented and watched several movies just fine.
To to volume I moved the iTunes database to my TimeMachine and connect via wireless.
Sometimes it requires to first find and select the Data folder on the time machine because iTunes otherwise adds a new data folder locally.
This is the only potential problem that I can see, but it has always worked fine. Just from time to time I get this annoying quick time error when renting movies.