Compatibility with Mighty sites multi-site and rockettheme lexicon tpl

Hi I am using the jfb connect on my main site www.candam.com where it is nicely configured and operational.
I am in the process of redoing the front end of the site with a template called Lexicon from rockettheme.com supplier. To avoid disrupting production site, I have installed a test site with the Mighty sites multi-site extension to set up my new site on the Lexicon front end, but now when I use the template built-in login panel, it does not use the jfb connect. I tried to disable the template panel and create a second sclogin module and attached it to a top c template position, but this does not seem to work either. Is there a known incompatibility with Mighty sites or with the rockettheme template?
if not, how can I debug this? What should I do to get a simple login button in the expected gantry position, and with a working jfb connect pop up window just like in my www.candam.com production site?
The test site is visible at www.nagoon.com and uses the database from the first site in Mighty Sites.
Thanks for any help, I need this new look and feel to be up and running soon.