Ok, thanks. With further testing and the changes I made to the plugin, I am still not able to recreate your issue on my dev site, nor have I found a resolution for your site. I went a step further to see what you have installed that might be causing this issue, but was not able to find anything.
In my opinion, yes, our plugin has an incompatibility with your site, but I am still convinced it has to do with another extension. Our plugin works as expected on our test site with the latest version of JomSocial (v3.2.1.5)
My apologies that we were unable to find a resolution.
I'd love to change the world... but they won't give me the source code!