Will try like 3-5 times to log into Napster server, and will get disconnected because of invalid password. I've checked the password and it is correct. If I try a bunch of times, it'll eventually log in. If I try it with the Windows version, it's never a problem.
One resolution to the problem is to reenter and resave the password in the settings box. Unfortunatly, you might have to do this every time you startup Napster.