caching problem after login ( admin bar improved )

hi, i’m using the admin bar improved login, its great but i have issues with the cache. at the moment i’m not using any cache plugin.
the problem is that when after an users log in, he’s seeing the pages,he he has visited before, still like he is logged out. when he refreshs the browser – he is logged in.
is there any function or code i can add to check that after the login process the admin bar gets updated?
thanks a lot in advance, ben

http://wordpress.org/plugins/wordpress-admin-bar-improved/