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I switched to a fresh account and had no trouble turning on the plug-in (well, it was already enabled when I launched OmniFocus). I deleted OmniPlan from the Applications folder, deleted OmniFocus' database and preferences, relaunched, and the OmniPlan plug-in was no longer enabled and was not available to enable. Quit once again, reinstalled OmniPlan, deleted OF database and prefs again, launched, plug-in was there and enabled. Are you running OmniPlan from a spot other than the Applications folder?