Plugin page : http://wordpress.org/extend/plugins/user-access-manager/
Despite what it says, it works fine with Wordpress 2.9.2.
I'm using this plugin to hide a page (from the navigation and from being accessed) from users that aren't in a specific group.
I've encountered a small, but annoying, issue with it and the bfthumbs shortcode though.
I'm using this shortcode on 2 different pages, which aren't protected by this plugin.
It works fine on the page that use these bfthumbs options (logged in or not) :
category="cat1" numposts="20" numcols="5" orderby="title" order="ASC" width="150" height="150" marginright="20"
But it doesn't work with those ones, the thumb'ed posts aren't displayed (you have to be logged in and included in a group created with UAM to make them display) :
category="cat2" numposts="0" text="false" order="ASC"
It works fine if I deactivate the plugin.