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I tried to update your JS into latest version (3.1.1) and i enabled error reporting to developement..
First, i got warning on module "Knu JS Community Menue Everywhere", disabled it but still invalid token..
second, after read carefully on your first post, i think this issue about your htaccess file.. because if you disable only URL Rewriting, everythings look fine..
By the way, when i go to extensions > template manager > template > click on Jsn_metro_pro Details and Files
there are a lot of error :) can you inspect your template first ? :)
Can you give me FTP credentials? i will trying to check it.. :)
I think i'm gonna crazy about this issue :D i don't have any idea to resolve this issue.. i tried to edit your htaccess file and still didn't got any result.. Huft...
As far as i know from joomla forum, this is about system cache but you have been disabled it.. Can you try to do a fresh install (only joomla 3.2 and jomsocial 3.1.1) on separated server like what you did before ?
And last thing, can you check your template issue? as i said before there are a lot of error and warning on your template when i access into template manager > templates > click on your active template..