The Prestige & PS3 - Stopping glitch?

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I just played my US copy of The Prestige on BD in my PS3 (with latest firmware as of today, February 9th, 2009), and it played through the whole movie fine. But when I got back to the main menu, I couldn't stop the movie! I hit the Stop button, but was told "This operation cannot be performed here" or whatever the little message says. I had to start the movie again for it to stop properly (which means next time I insert the disc, the film will auto-start already into the movie, and won't go to the beginning like it would on a fresh start).

Now this is hardly a big deal, so I didn't make this thread to complain - I'm just curious if this is normal, i.e. if other people experience this with their copies of The Prestige and their PS3s. It just seems like such an odd thing that I'm wondering if there's something wrong with my copy of The Prestige.

Thanks for your time and replies.