your problem seems in the Cairo Dock's packages, not in the system.
The Sabayon's default installer, is Entropy. command is equo and the new GUI is Rigo, Sulfur is obsolete.
Portage can be used, can be mixed, but this is not reccomended for begginers.because some edition of configuration files is mandatory, or the system may be turned useless ou propose downgrades, instead of upgrades.
ALBERTO FEDERMAN NETO
Favorite Distros: Sabayon, Gentoo, Mageia and OpenSUSE