I am having the same issue with different results. I did enable the jquery, as mentioned before, and then I did get a logging in popup, but then got taken to a white page with the following error:
Fatal error: Call to a member function clear() on a non-object in /home/womenofi/public_html/libraries/joomla/table/user.php on line 345
After hitting the back button, I got the following messages (see screenshot). I was able to see the site, but when I go to the Jomsocial page, I keep getting the above error message on a blank page.
NOTE: I do see my profile in the user database, but it's showing as not enabled. After enabling it, the Jomsocial section does show up, but I'm not logged in.