Hi all together,
I do have this problem too. The moment I upgraded to ML there was no sync of any calendar entry any more. No matter which direction MAC <-> iPhone or iPad. Deleting the calendar on the iPhone worked, replacing it from my Mac did not work.
I have searched some forums and found the interesting opinnion that Calendar (successor to iCal) does not sync with USB and cable anymore.
But there is one thing which makes me wonder:
Notes has been moved away from the iTunes sync dialogue about infos. Notes can, as far as I understand, only be synced via iCloud.
Contacts and Calendars have not been moved out of the dialogue. There are still there and contacts works fine. Calendar not.
Anybody any idea?
Thanks to all :-)