Problem with Kunena 3.x
Fabrik3.x and Kunena 3.x.
1) Install latest Fabrik version
2) use phpMyAdmin (or whatever), find the "Fabrik - System" plugin in the #_extensions table, and set 'ordering' to -1.
3) Empty Cache (site and administrator by FTP - I had only index.html file on each cache folder )
4) Install Kunena 3.0 package