you must put out the internet cable from the xbox and there the restriction message will disappear and you gonna be able to play.its happen to me too. Parental Restrictions on your console. They can prohibit you from communication altogether, and watching Theater films is considered communication.
- Thanks for the pointers! I found the source of the problem in my Privacy Settings on my XBL account page, specifically under Member Content. After changing my selection from Friends Only to Everyone, I was able to view films in Theater mode at anytime, regardless of whether or not my console was connected to the internet.