Form is invalid?

Hi, I’m getting this error: “The submitted form was invalid. Try submitting again.” According to I should change the form timeout values. Well, I would except that I’m unable to login to the Administration Control Panel. The log in for just keeps saying that I need to enter my password.
I’d update the table directly, but I don’t see the files for the virtual host where all my other virtual hosts are located. So I assume DreamHost is doing some kind of shared installation.