Possible Fix?
I was having the same problem. I was listening to Sirius, then it was asked me to login. When
I got to the login page it kept refreshing and I couldn't login.
I tried to login again today and it was the same problem. I went to the app store, updated and had the same problem.
I then tried something different and it worked. I entered my usename, the verification code then password. I don't know why, but it worked.
I am not sure if I got lucky or what.
Good luck!