[joelande]

Here's the fix:

The "Completed" perspective in OmniFocus Mac 1.7 was based on Project View (which doesn't work with iPad).

After upgrading to OmniFocus Mac 1.8, select the "Completed" perspective in the Perspectives window.

Use the gear menu to "revert perspective to default settings".

Sync.

Launch OmniFocus iPad.

Sync.

Completed perspective for iPad restored!