I've been syncing calendars between Thurderbird and Google successfully. Recently two calendars were deleted in Google. These calendar entries continue to appear in Thunderbird. There was a post about deleting the calendar profile, but I am not knowledgeable how to do this. I uninstalled the Add-Ons and reinstalled. Then I attempted uninstalling Thunderbird and reinstalling. If I select File, New, Calendar, in an attempt to Deselect the deleted calendars, this function is greyed out and it does not list these calendars anyway. Maddening. Please help. Thank you.