Hi Tim,
It sounds like it was not able to 'log in' to your account. Are you sure you specified the correct username and password in the GUI ?
Also, please enable the checkbox that says 'show debug messages' and let me know if you see anything.
I just tried pbstats on my account - it worked fine.
Sometimes, it is a network or server issue at PBase - trying a little later may also help.
regds
arjun