I just updated the Appointments + plugin on two sites and it caused two different themes to break.
I had to rename the Appointments folders to get the sites back up.
Not sure what I need to do get the plugin back up and running again.
http://cornerstonefamchiro.com/ gave this error:
Fatal error: Call to undefined method Google_Client::setLogger() in /nfs/c07/h01/mnt/102891/domains/cornerstonefamchiro.com/html/wp-content/plugins/appointments/includes/gcal/class-app-gcal-api-manager.php on line 45
http://sandiegocountychiropractor.com/ gave the error seen in the screen shot