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I may have a solution for the problems described in 1.0.2. I had the same troubles. I found out that clearing the password manager in Thunderbird (for the google calender items; not for imap etc) did the trick.
After that reinstall your calender and it worked for me. (till now)

Это отзыв для предыдущей версии этого дополнения (1.0.2).