I'm Mac user and i have a curious case.
One of my movies have a strange behavior. The movie is 2,35:1 and always when a play it local in Quicktime or streaming in PS3 Media Server, the video rescale to ridiculous 4:3. If a play it in VLC, he plays fine!
WTF is this?
The movie: http://www.mininova.org/tor/2417536
I use a portuguese subtitle.
I have other movies in this scale and all movie plays fine.