Hoi,
Thanks again for your patience. We've been unable to recreate the avatar issue. When we update the user's avatar image in Kunena, we specifically delete that user's thumbnail folders, which will force Kunena to regenerate those thumbnails whenever they are requested. There's no way we know of to force the generation of thumbnails, because different areas of Kunena call for different (configurable) sizes. Therefore, the thumbnail is only generated when it's needed (for speed) and for the appropriate size (to prevent wasted processing for thumbnails that won't be used).
If this is only happening in jReviews, and not when you view a user's actual Kunena profile, I'd have to guess that jReviews is simply not requesting the thumbnail properly. They may need to update how they are fetching the thumbnail in a way that it instructs Kunena to generate it if it doesn't already exist.
Finally, regarding the Facebook profile URL, that looks to be a new addition to Kunena's profile. Not sure what version they added that field, but you can easily add it to display by making the following change. In the /plugins/jfbcprofiles/kunena/kunena.php file, towards the bottom around line 203, you'll see a function getProfileFields(). In there, after the "location"=> 'Location', setting, update it so it looks like:
"location" => 'Location',
"FACEBOOK"=> 'Facebook URL',
"ICQ" => 'ICQ',
Hope that helps,
Alex