Cyn-
Hmmmm... I'm not sure what exactly is going on here - you'll definitely want to contact
the support ninjas.
So they can figure out what's going on, can you include the following information in your email? (Actually, it'll probably be easiest if you open OmniFocus and select "Send Feedback" from the help menu. That'll send some information that will help us.)
It would also be helpful if you could attach the following information to that email.
A screenshot of the "iCal" tab of OmniFocus' preferences. (You can take a screenshot by pressing command-shift-4, and then dragging your mouse over the area of your screen you want to take a picture of. The picture will be placed on your desktop.)
Next, if you could open up your Applications folder, and then the Utilities folder within that one, and launch the application named 'Console'. Press the 'clear display' button at the top of the console window, and then try to do a synch in OmniFocus. If any text appears in the console window while this is going on, please copy and paste it into the email.
We'll probably have a few more questions after you send us that information, but that will get us started.
Thanks, and sorry for the inconvenience this is causing!