The 3.8 code for Fabrik is now available on github, in the 'master' branch. If you are familiar with updating Fabrik from github, we would appreciate it if you could test this code on J! 3.8 for us. Once we have some feedback, we'll build a 3.8 release.
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