I can login just like I always have...I have multiple e-mail accounts that I had setup and none of them show up anymore.
I tried simply adding one of my accounts back in...GO kept telling me it couldn't connect to the server. I went to my CPanel to make sure I had the correct settings and I did.
My dad uses the same GO service (he hosts it) and we checked his account and everything is working perfectly...no issues at all.
I hope that answers your question.