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Hello Jomsocial,
I am upgraded the jomsocial on my live site,after that i am facing few issues:-
1)"Create an account" link is not working.
2)The "Log Out " button is not working.
The logout code is not come from Jomsocial code, that is come from Joomla code, from component=com_users and task=user.logout. so please you submit this issue to Joomla forum.