Login to browser based version stalled. So I cancelled and relogged to home using my regular Firestorm viewer... and couldn't. Waited 1 minute, tried again, success!
A friend who uses a PC, not a Mac, had the same problem but COULDN'T relog with her regular viewer AT ALL.
A message to Technology Forum / Second Life Web outlining the issue received a reply from a Linden saying a) others had had the same problem b) try logging in to a different destination and then TPing to home... and that worked for my friend.
Please take note, for future development of the browser based version