Calendar-Events in Thunderbird/Lightning do not show after each start
My calendar events in Lightning do not show in the Month/Multiweek/Week/Day display each time I start Thunderbird. All my calendars are listed in the calendar list on the left-hand side, but the Events are not shown at their date&time. The 'Hide' icon (the eye) next to each calendar in the list is NOT crossed out for all of the calendars, but the events still do not show. Each time I start TB, I have to click each eye icon twice (to hide, and then to show) for each calendar. Right-clicking on 'Show all calendars' does not work either.
I can't find a description of this error nor a solution anywhere. I'm using recent versions of TB (V 78.3.2) with the built-in Lightning and of 'Provider for Google Calendar' (V 78.0.1) to show my Google calendars in Lightning
Has anyone experienced this problem or can suggest a solution? Thanks a lot! Holger