I can confirm this. I am running stock ati open source driver (for my 9800 pro), aiglx, and compiz from feisty repos. I am not running xgl. Maximizing windows places their bottom border behind the bottom panel.
-- Maximized windows go behind the bottom toolbar https://launchpad.net/bugs/72788 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs