I also got the same problems with "off for maitinace" dialog window form time to time. I do the same procedure dutchie and VanBuren do, when it taking to long Ill just kill it with the task manager and relog. It seems to happen time to time. even if you just had take a break for like 10 min and try to login, it just can popup. But when it dose I just login again, and it works.

Oh yes, I hate that bug as well!

Yeah, the sky bug is really annoying. Sometimes, I even had to relog more than once to get rid of it.