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Sounds like we should get OmniFocus 1.8 out of "sneaky peek" status as soon as possible! You're running into a series of perspective-syncing bugs which we've fixed in OmniFocus 1.8 for Mac (currently available as a "sneaky peek" release). OmniFocus 1.7 has a bug where it sometimes loses track of which perspectives you have, and then it tries to synchronize its notion of your perspectives back out to the other systems which deletes all those missing perspectives.

OmniFocus 1.8 for Mac fixes those synchronization bugs, and also knows how to restore the now-missing Completed (by date) perspective.