blank page on logout

I have an easysocial here http://www.cmfionline.org/mountolive.
the joomla install also has easyblog and easydiscuss and komento.

all users management are from easysocial.
when i login and then try to signout, it ends up with a blank page.
Also, when i use the normal joomla logout button, nothing happens.
The ususal joomla login/register are pointed to the easysocial user login/register pages.

I need help with this. I want a smooth user management procedure.
I can give you admin access if you do need it.