I was having this same issue with my ASUS EeePC 900. However, the problem went away after following the steps from comment #28, which including updating to desktop-switcher_0.4.4-1ubuntu2_i386.deb.
I was having this same issue with my ASUS EeePC 900. However, the problem went away after following the steps from comment #28, which including updating to desktop- switcher_ 0.4.4-1ubuntu2_ i386.deb.