Client crashes when I attempt to log in.

I have also had this problem yesterday, but after a few hours it stopped. Now it's happening again. Whenever I try to log in, the "Loading - Please Wait" thing in the upper left corner appears, but straight afterwords the client turns completely white and the client crashes. I have no problem loading the client up, but whenever I try to log in it does this. My username and password are both correct when I log in. The weird part is, this only happens on this account. I have made another one (Obama) and it logs in perfectly fine. Is my account glitched or something?