Hi-- thanks so much for looking into this. So I did just what you said:
-created ten events in RTM
-refreshed RTM calendar in Rainlendar, all events appeared
-deleted events in RTM-- in this case, I completed one event and then refreshed, then deleted a couple more, and then refreshed. Every single event showed complete in Rainlendar except the last one.
-added three new events to RTM (now I have four total)
-refreshed calendar in Rainlendar, four total RTM events appear
-completed two events in RTM
-refreshed calendar in Rainlendar-- four total events appear!
-checked RTM-- all four events are back in the calendar, marked as uncomplete.
I'm attaching my .ini file, just in case you can find something in it. I'm happy to send you any other files that would help (.ics, etc).
One idea I had: when I upgraded to the beta version, I think I kept my original .ini, because I didn't want to have to go through all the settings again. Would that have done it?