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I checked the box to sync with iCal. After some time I went to get my iPad and found

Calendar "omnifocus reminders" at sync10.omnigroup.com requires authentication

On my screen LOCKING my screen. I've put in the correct name and password and tried canceling it but it's frozen. I can add and delete characters but I can't control my iPad; the pop up asking for my user name is blocking me from using it -- I can't even power down my iPad!

What to do?