The current beta http://www.nvnews.net/vbulletin/showthread.php?t=122606
also seems to have the same 6 screen issue.
I tried this on the updated version of arch linux amd64.
Strangely, G103M is listed as supported GPU in the README. Wonder if the problem exists on G103M aswell (?)
However, the xorg.conf twek suggested above works for me for now.