I have 2 508s, and received a new yellow smartcard to replace the blue card in one of them tonight. Blew away all of my timers, and of course, stupid me, I didn't even think to check until I realized that nothing had recorded tonight.
Details here: http://www.dbstalk.com/showthread.php?t=23906
Details here: http://www.dbstalk.com/showthread.php?t=23906