BuddyPress.org

Hmm. Looks like the plugin is active at the moment (I see a javascript include). I also see a lot of other plugins; if you’ve got a test server I suggest disabling all the plugins other than BuddyPress and seeing if it works. I suspect this is likely due to a conflict.

Another idea is, when you previously ran the BP Template Pack, did you restore your theme’s files to defaults? e.g. removed the BuddyPress stuff it added. Also, as far as I’m aware, you can disable the BP Template Pack — it’s a once-off thing.