When I load up 5 of my clients often one will act strange. I will enter in my username/password and then it will go to a "cancel" popup box. I have to hit the "cancel" button, enter anything in for my password again (it doesn't matter if it's correct or not), get the "cancel" popup again, and then enter my password for a third time. It always works on the third time, and it will never work the second time. It seems to be random on when I get this type of problem, as sometimes logging in works fine.

Sorry if it's confusing, but is anyone else experiencing a similar problem?