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I actually got this error on my phone today, and what we found there lines up with the data we got from a customer that sent in their database.

It looks like the server (MobileMe both cases we looked at) is abruptly dropping the connection while sending us the zip file that caused the error. (We can tell because the last bytes of the file are the letters "unauthorized" instead of the remainder of the zip data.)

We can think of some things we can change in OmniFocus to work around this problem, but until that gets rolled out, folks will want to use the workaround I posted above to re-sync a copy of their data. Apologies to everyone affected by this.