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Bob, your best move is probably to call up the Omni support ninjas and have them walk you through the recovery (they may also want to see if they can figure out what happened). They are in the office 10-5 M-F Pacific time, and the phone number is 800-315-OMNI or +1-206-523-4152.

OmniFocus syncs the entire database, so any of your devices should be able to regenerate any other device, with the exception of any changes that hadn't been synced.