Not Authorized to Play Content?

I just started trying to use Front Row on my Macbook, after downloading the Mad Hatter Front Row Enabler for Lion.

Problem is, I can't seem to watch my personal iTunes videos from Front Row, as I keep getting a 'You Are Not Authorized to Play This Content' message when I try. These aren't purchased or rented videos - they are videos I made myself that I can play quite well in iTunes.

I have iTunes sharing turned on (Share My Library on My Local Network).

Any ideas as to why Front Row is giving me this message? Thanks.