Thanks to Craig Hockenberry for pointing out that iPhone developer & distribution certificates are beginning to expire. I checked my keychain and found that my developer certificate expires tomorrow and my distribution certificate expires on the 25th. I’m not sure if I still have my original certificate signing request (CSR), so I’ll probably have more work to do.
For any other iPhone developers reading this, open Keychain Access, do a search for ‘iPhone’ and note the expiration dates. Don’t be caught by surprise.