all exhibits disappearing when I delete one

Twice now I have tried to delete ONE of my exhibits from the admin panel and it has made all the exhibits disappear. I am using Omeka 2.0. What is the problem here?

The IT have restored the exhibits each time and this is what they said last time: "In the log at 14:07, I can see entries that show a delete statement for every exhibit_pages (all 31 or them) and every exhibit_page_entries (all 101 of them) as well as one delete statement for exhibit ID 15, which is Angola." IT believes that the Omeka Admin panel has a bug. Does anyone know how that can be fixed?

This bug was fixed a couple versions of Exhibit Builder ago. Download the latest and upgrade the plugin, and all should be fine.