Plugins EC-Pro & Community Events
The site is hosted with wp-engine, there is an open support ticket with them as well. I applied the update successfully a couple of days ago from 3.0.1 to 3.1. Everything as fine, the upgrade went as they always do. Several hours later, I needed to restore the site from backup. I pulled the image from the wp-engine archive from the last known good point, which was before the 3.1 upgrade was applied. Now, when I apply the update, the process fails, and Event Calendar is removed from the install.