You might also want to check on your google calendar page that the calendar you want to appear in the MM module is appearing on your calendar pages. On the left side of the google calendar page you’ll see “My calendars” and “Other calendars.” When you click on the colored square to the left of each calendar it will enable/disable that particular calendar in your main visible calendar (The big one, day to day). Make sure the calendar is showing in the main calendar.
Restart your MM