BuddyPress.org

I am using wp 3.1 and bp 1.2.8.
No one of my side can change or upload avatar. No one can sent private message, also problem with ‘create a new group’. When I click ‘create a new group’, only the page refreshes and nothing created. Same in avatar and private message.
I am using Buddypress since 2 months and the problem arises 1 week ago. Still facing this problem, after update to new version yesterday.
Also try to uninstall and remove bp data from database and install again, nothing change.
my site url – http://shopnobaz.net/