If it is not taking your username or password, say like you enter your name and password and it says something along the lines of "user not found" or "invalid password" and you know it is right, I would be very cautious. I had a virus on my comp that did that very same thing, on every site I had. I couldn't even log into email. I think it was called a "key logger". I couldn't get the damn antivirus to find the virus so I formatted my comp. I have too much valuable info in my online banking and stuff to risk someone having that info. I'm not saying that is definitely what it is, but be careful.