Fabrik 3.8.1 has been released. It is mostly bug fixes and feature enhancements, but does include two new plugins (push notifications, and the sequence element). As usual we strongly recommend testing the new release on a sandbox if your application is mission critical, and always do an Akeeba backup before updating.
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