tburns011, as a professional who supports Mac users in an all-Google environment, here are my own personal notes on this issue:
iCal users who sync with Google calendars are having widespread problems:
- Google calendars receive an error when syncing/refreshing (marked with a warning triangle)
- Events you delete in iCal remain in the Google calendar and are not deleted from the server, resulting in the can't sync error, above.
Google is aware of the issues. It sounds like they are waiting on Apple to resolve it, from the second reference link, below.
Currently, there is no true solution. You may find some temporary relief by deleting the account from iCal, then re-adding it, but if you try to delete an event, your sync will immediately break. Google's recommendation is to only delete events from the web interface or an iOS device (iPhone/iPad/iPod).
Until either Apple or Google resolves this, the workaround is to use Google calendars under the web interface at <https://accounts.google.com/ServiceLogin>.
Also, you can use iOS devices such as iPhone and iPad without incident.
- Google Calendar Known Issues <http://www.google.com/support/calendar/bin/static.py?page=known_issues.cs>
- Why doesn't my iCal sync with Google Calendar anymore? <http://www.google.com/support/forum/p/Calendar/thread?tid=6791daf5ef644ebf&hl=en>
Best of luck to you,