At inital boot of OS X Leopard 10.6.8 and multiple times throughout the day, a pop-up appears asking to "Enter the passphrase for the key shown above". Whether the correct passphrase is entered or not (or if cancel is pressed), the prompt will go away after 2 attempts. It will then return quite a bit later. This isn't preventing anything, but it is annoying. The only way I have been able to solve this is to re-enroll the user with PGP and hope that we get lucky and not get prompted for the passphrase anymore (which usually works after a few tries, but is annoying to deal with). Screenshot attached (with the top portion removed to clear out the user's email).