I just created an account, and agree the administrator profile is bringing me to a 500 error. However, my profile, and the one below works:
pakistanrc.com/prc_t3/rc-community/babar-sattar/profile
Is there anything in the admin user's profile that could be causing a problem? I'm not sure what's happening with that one, and since you're viewing it within JomSocial, I'm not sure how the upgrade would have affected it. JFBConnect doesn't 'do' anything when you view someones profile, and shouldn't change the normal behavior.
Please test my new profile and see if there's anything else that might right a bell. I haven't logged into the admin area of your site yet, but can if this doesn't help ring any bells.