Comment 105 for bug 1029289

Something changed in how Google handles the calendar API requests, which caused evolution-data-server to break. This is why many of you have reported that the problem disappears the Google Calendar gets disabled.
Fortunately, the upstream developers for evolution-data server have already fixed the issue, and the next Ubuntu version (14.10) won't be affected by this bug.

I'm now working to backport the fix to 14.04, and have it delivered as an update.