User Can No Longer Edit Calendars

Hi,

There are three users who are set up to edit the WP Simple Booking Calendar plugin for my site. One admin (me) and two editors. One of the editors can no longer edit the calendars like he did in the past. The calendars don’t appear at all on the page when he goes to edit them. The second editor and I can still edit the calendars without issue. Was there an update to this plugin that I missed? Do I need to install the premium version for this editor to have access again? Any advice would be greatly appreciated!

Installed WP Simple Booking Calendar Version 5.9 (Free)

I’m using the Twenty Fourteen theme.

Here is my site link if you need it. http://dockofthebaymarina.com/availability/dock-slip-availability/

Thanks!