I have the same problem. I thought it happened after transferring the theme to the new server. When I restore the theme on the old server the calendar worked. I updated the theme and the calendar … disappeared. I can only see events in the list but not in the Google Calendar grid. Instead of calendar there are only two balls spinning around each other.
This is clearly a problem with the theme update.
Similarly after updating a theme something happened with the drop-down menu, which no longer expands.
Does anybody from the Imithemes stuff answer and help their “old” users and clients or they help only those clients who have paid support in envato market? (the best way to lose customers in the future)