My Google calendar is synced to my Pre. About a week ago, I noticed a full day event (with no title) with a duration of about 10 days on my calendar when viewed on the Pre. When I click it, I get a message that the event no longer exists, but there is no way for me to delete it from the calendar. It doesn't show up in the Google calendar when I go online. I tried removing and reinstalling the account, but that item keeps coming back. Any suggestions?