US: Ubuntu 11.10
Video cards: Nvidia gt 550ti and gt 440ti
Driver: latest stable driver from PPA

I have a quad monitor system with 2 nvidia cards. Twinview does not work. That is you cannot move windows between monitors in 2 video cards system. When I use xinerama with Separate X screen. (using Unity 2d or Kde, I do not expect much from Unity 3d or gnome 3). I get the four displays. The mouse can move between the displays. But when I click the menu button or and application on the launch menu nothing happens. No window is created.

I'd appreciate any help in debugging.