I believe those applets are for the Gnome Flashback desktop only. If you're using Gnome Shell, they don't work.
If you want to use them, I think you need to install the gnome-session-flashback package and then login in using the Flashback desktop.
Dell XPS 17 L702X i7 2860QM 2.5GHz - 32GB RAM - 4G WWAN - Pioneer TD05-BDR
NEC Spirit 550 Pentium 4 3.6GHz HT - 2GB RAM - nVidia 7600GT - Promise TX4310 RAID + 4 SSD's - Pioneer BDR-209DBK
ASUS P8P67 EVO i7 3770K - 32GB RAM - 2x nVidia 660GTX SLI'd