Calender inop on TB19 Rated 1 out of 5 stars

I have one computer with TB18 where the Calendar works OK, and unfortunately the other one is TB19 where calendar is inoperative. I will not go back to updating in the beta channel until they get this resolved. I have calendar become inoperative many times when the version was updated, but this has been almost a week. What is the matter with the people at Mozilla, don't they realize the people actually depend on these applications. Almost anything else could be inoperative and there would be a work around, but one of the reasons that I have stuck with Thunderbird is for the calendar.

This review is for a previous version of the add-on (1.9).  This user has a previous review of this add-on.