Well I had a similar problem with my x-files blu-ray disc. I'm from the Netherlands, bought the B region version and have a Panasonic Blu-ray player. Disc locked my player the first time, second time it played, after a few [!] minutes but the player made a loud sound, you almost could hear it spin in the player. Brought the disc back, did not yet replaced it with another copy because I fear it will have the same problems.
I wanted to try the UK version but after this post I'm not sure if this will help!