The only thing that really stands out to me is that under the section "screen" on your dual X setup is that you have an option in there:
Option "AddARGBGLXVisuals" "True"
and on your twinview you don't. Have you tried adding this to your xorg in the twinview setup?
Once again, as Saddle has recomended... back up your xorg.conf file to something like:
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sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf_backup
If you get stuck without video you can get your way to a command prompt and just enter:
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sudo cp /etc/X11/xorg.conf_backup /etc/X11/xorg.conf