.ics appointment doesn't post to calendar

If I open a .ics file, EMclient will show the appointment in a window, but when I press “save” it flashes for just a second on the calendar where the appointment should be but then disappears. The only method that works, is to drag and drop the file on the calendar.  Is there a fix for this?  BTW I use norton anti-virus if that matters.

To the left of the Save button is the destination calendar. If you click on the calendar name and choose another, what happens?