I'm attaching a zip file with an updated kunena.php file. If you could, please unzip this file and copy it to the /components/com_jfbconnect/libraries directory overwriting the kunena.php file that already exists there. This updated file will detect both Kunena 1.5 and 1.6 and import information and avatar appropriately depending on the version. Any feedback on results you can provide would be great.
We'll likely be putting out JFBConnect 3.0.2 this weekend which will have this fix along with 2 other minor issues we're working on now.
Thanks for you patience and your help in diagnosing the issue!
Download here