Rated 4 out of 5 stars

Was a lifesaver until one month ago and the only way to seamlessly syncing a calendar between a mac and a PC. One month ago the problems started with the update to 1.02. Installing version 0.32 on my mac and disabling the calendar on the PC worked for another two weeks. Now, even version 0.32 stopped working (Thunderbird 31.2.0, mac OS X). I get extremely annoying popups that ask me for the Google Calendar Login, and when I type in the password, the same popup appears a second later again, and again, and again. The only way to survive is using the crappy google browser app and the Android smartphone (which is the only device which was completely unaffected by all these problems). Interestingly, this only happens for two of my google calendars (according to Murphys law, the most important ones). Some other calendars are fine, surprisingly. Has anyone experienced similar bugs and figured out a workaround? I need this app!!! Will change to 5 stars if it works again.

Edit: Now all the calendars stopped to sync :/
Edit 2: Was able to fix my mac calendars by simply upgrading to 1.02 and entering the passwords. Thanks to the other reviewers for the instruction. Knock on wood that it keeps working. Won't try to sync with my PC for another week or so to avoid new trouble.

This review is for a previous version of the add-on (1.0.2).