When I use cairo-dock with sawfish, I notice these two problems:
*
Windows don't maximize as much as when cairo-dock is not running: my
cairo-dock is on the left of the screen, and maximized windows leave
about 1/3 ot the left part of the screen empty;
* When clicking on a sub-dock in cairo-dock, sometimes a black
rectangle with the icon in this subdock appear at the topmost leftmost
position of the screen. This is not a window, it looks liker some
off-screen drawing that should'nt appear...
This is on Gentoo, on a machine with an Intel GM965 chipset; I use the latest sawfish and cairo-dock.