[Lilux-help] compiz on kde

Hello I installed compiz on kde on kubuntu feisty. I can get no cube, because I only got 2 desktopsI When I right-click on a desktop to configure desktops, I can increase the number of desktops, the number of desktops increases in thje taskbar, but when I rotate the cube, it has only 2 desktops. Even if I increase the number of virtual desktops in CompizConfigSettingsManager (General Options->Desktop Size->Number of Destops, it has no effect. The line is also written in blue, whereas the other things are written in black. Does it mean something. I use a NVidia Card with the proprietary driver for it. Can someone help me, please. Thanks. Al