After recently updating its task management app to version 2.12, the Omni Group quickly released OmniFocus 2.12.1 to address an important database migration issue. OmniFocus 2.12 for the Mac (and OmniFocus 2.22 or 2.22.1 for iOS) required migration to a new database format. If you performed that migration and had previously set a distinct encryption passphrase, verify that the distinct passphrase is still in place because a keychain management bug in the previous version may have re-linked the encryption passphrase to the sync password.
OmniFocus 2.12.1 also fixes a bug where the next instance of a repeating item was not created when entering the completion date in the outline, addresses a hang when completing projects using the Complete toolbar button, and resolves a crash that occurred completing items in Quick Entry. ($39.99 new for Standard and $79.99 for Pro from the Omni Group Web site, $39.99 for Standard from Mac App Store with in-app purchase option to upgrade to Pro, 31.9 MB, release notes, 10.12+)