[ubuntu] desktop switcher shortcut fails on second desktop

view story

http://ubuntuforums.org – Hi, I'm using 12.04. When using the desktop switcher keyboard shortcuts (CTRL+ALT + ARROWKEY), I noticed that if you are on a desktop and close all the windows then the shortcuts don't work. This happens when you are not on the first desktop. To replicate, go to a secondary desktop, open any window. Notice here that the shortcuts work. Now, close the window and try using the shortcuts. Nothing. Is this just my machine? Is this a bug? (Hardware)