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Probably your best option is to wait until 10 AM Pacific time and call up the support ninjas at 1-800-315-6664.

You're using MobileMe as your sync host — by any chance do you also use the MobileMe iDisk sync? The two can conflict, potentially damaging your database, and a slightly different configuration should be used to avoid problems (storing the database in a part of the iDisk where the sync isn't done). The support ninjas can help you with that as well (though I suspect they would suggest you simply use the free Omni Sync service instead).