A thread over at AVS Forum has been running for weeks now, discussing what
many have discovered; "Blu-ray disc rot". Some users are reporting finding small spots on their discs that render them unplayable, particularly with "The Prestige". However, as it usually goes, many other users are reporting that their discs are still working correctly and do not show the dreaded signs of rot.
It's impossible to use a forum to judge how widespread a problem really is, but in the past, forum posts have lead to product recalls. If you check your Blu-ray titles now and find that the data side seems to be showing signs of rot (picture below), you should seek a refund or replacement disc immediately.
Here is an image posted by the user Venom5 on AVS Forum...