Comment 6 for bug 145704

This is some strange behaviour in Compiz. There is a difference between "viewports" and "desktop" By default Compiz uses 1 desktop with a number of viewports. Therefore, all viewports belong to desktop 1. That is why the tooltip says "Desk 1". You can change this in the Compiz settings menu (general / desktop size), but that has some downsides. For example, I can't set it to three desktop, crtl+alt+[left|right] no longer work, etc.
In general, I noticed that there are a lot of bugs in switching between viewports.