iPod Quicktime X not playing Purchased .m4v files

[Princess Cake]

Whenever I purchase a movie or tv show from iTunes I like to move it to an external drive and use Quicktime X to play the video. Up until now it's worked great but recently a large portion of my purchased video content won't play... Quicktime X loads up but it just sits at a black screen and the play button does nothing.

The videos DO still work in Quicktime 7 but I'd like to use X like I've been doing. Anyone know what might of happened?

 

[Supernerd]

Try ripping a DVD and see if the .m4v opens in QuickTime. That will show if it's specifically purchased movies and not imported or created ones.