Same issue happening here. Just registered an account today.
Tried with Firefox, Chrome, and IE. All are doing the same thing. Cleared caches and cookies and still no go. Would be really nice to actually use this service.
If I can't get the free account working, how am I supposed to justify paying for more?
EDIT: Working now... I suppose to anybody else having this issue, it can take a while to get the cpanel access to your account up. Patience is the key word of the day