I've just worked this problem through with a friend, and he was having
the same issue.
Adding the following entry to xorg.conf under screen fixed the problem.
Option "AddARGBGLXVisuals" "True"
Tested after a reboot and everything worked fine.
I.e.
-----
Section "Screen"
Identifier "Default Screen"
Device "NVIDIA Corporation NVIDIA Default Card"
Option "AddARGBGLXVisuals" "True"
Section "Extensions"
Option "Composite" "Enable"
EndSection
-----
--
gnome-terminal does not start when using xinerama and nvidia
https://launchpad.net/bugs/58232
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