I know this isn't the Thunderbird forum page but when I access that forum there is no way to submit a question. If I go through the hassle of searching for an answer to my question, I find nothing that applies. Even after searching, there is no link/button/option to enter a new question so I will post it here and hope someone will tell me how to post to the Thunderbird forum or will move it to that area. I just upgraded to version 78.5.1 of Thunderbird. When it opens, my calendar tab is blank. Each of the entries in my Calendar List in the left-hand column has a button prompting me to enable it. I have done so and tried to synchronize Calendar but no events are displayed. If I close and reopen Thunderbird, the calendar shows no events, and the Calendar List in the left-hand column again has the Enable button next to each entry. See the attached image. How can I fix this?