Rated 4 out of 5 stars

Today there was a request to sign into my google account.
Now the calendar has every entry duplicated. Is this my problem or has something changed at your end?

This review is for a previous version of the add-on (0.32). 

Its a problem on my end. I have a preliminary version 1.0.1 that fixes this, but until the quota issues are fixed I'd suggest downgrading to 0.32 or 0.25.