Unknown column 'mpublished' in 'where clause' SQL=SELECT m.id, m.parent_id, m.title, m.menutype FROM `a8lav_menu` AS m WHERE `mpublished` = 1 ORDER BY m.menutype, m.parent_id, m.ordering
That query isn't a part of JFBConnect. It sounds like some issue with your installation in general of Joomla or some other extension. The 'mpublished' column is not a normal column for any database we're aware of. I also did a search for 'mpublished' on a full installation of Joomla 2.5 with JFBConnect installed and couldn't find it anywhere.
Do you have any plugins or modules that are meant to alter the menu system or change things on pages in the admin area? Is that error showing up anywhere else within, or outside of, JFBConnect?
Hope that helps narrow things down, but we'll need to find where that query is coming from before we can even guess what may be going wrong.