Can't see delegate google calendars in ios 6

I am intermittently seeing my delegate Google calendars, though not most of the time on IOS 6. My gen 1 iPad with IOS 5.1.1 can access them and sync with them, as well as iCal in my iMac running 10.8.2. I took my iPhone 5 to the Apple store. We tried turning the phone off and on, turning calendars for the gmail account off and on, uninstalling and reinstalling the gmail account, putting in the same gmail account as an exchange account with the first still there. We even tried this on a second iPhone in the store. There was no change in the result. The delegate calendars would show for a few seconds during the initial sync and all but the main calendar would disappear. I am lost as to what tp try next.