Comment 11 for bug 134563

strace output contains the following:
Gdk-ERROR **: The program 'gnome-terminal' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
  (Details: serial 1288 error_code 8 request_code 72 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

Graphics driver is 100.14.11 .

biketrials:
What is the output of
dpkg -l *nvidia* | grep ii
?

Additionally, does disabling Xinerama by adding
Option "Xinerama" "false"
to your xorg.conf ServerLayout section then restarting X make any difference (I'm assuming you don't use dual monitors with separate cards)?