Hi, Since upgrading to Thunderbird 78, when I start up Thunderbird and click on the calendar icon in the upper right corner, the calendar tab opens up, but none of my appointment/events show up. I have a Google calendar and use Provider for Google Calendar (ver 78.0.1). I am able to get my events to show up by clicking the "Hide" icon next to the calendar name twice (hide/unhide). Note that the "Hide" icon is indicating that the events for the calendar are visible and when I click it once it turns to the icon that indicates the calendar is hidden and then clicking it once more, the events show up and the icon goes back to visible. I have searched for a fix and have not found anything on this issue. This makes me think it is not a common issue. Has anyone else encountered this? Does anyone know what is causing this and how to fix it? Angelo