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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?

Это отзыв для предыдущей версии этого дополнения (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.