After changing my Apple ID password (which is used by MobileMe, iTunes, developer connection, etc.) I found that I could no longer publish pictures to MobileMe from iPhoto. Even though I was logged into MobileMe — sync was working; iDisk was available — iPhoto would tell me that “an error occurred with the publication of an album” because my “MobileMe account information is not correct”.
If you’re hitting this, the fix is:
- exit iPhoto
- open Keychain Access
- find the key publish.me.com
- delete it
Next time you restart iPhoto, all should be well.