With 7600GT and 2xApple 23" I see the same with the nv driver.  With the
restricted driver the configuration works perfectly when using nvidia-
settings, saving the xorg.org without merging.

>  I am speculating that nvidia doesn't write to the RandR format
specification correctly.

This appears correct, output from nv driver (1:2.1.5-1ubuntu1):

Screen 0: minimum 640 x 480, current 1920 x 1200, maximum 1920 x 1200
default connected 1920x1200+0+0 0mm x 0mm
   1920x1200      60.0* 
   1680x1050      60.0  
   1600x1024      60.0  
   1440x900       60.0  
   1280x800       60.0  
   1280x720       60.0  
   1280x768       60.0  
   800x600        60.0  
   1600x1200      60.0  
   1400x1050      60.0  
   1280x1024      60.0  
   1280x960       60.0  
   1024x768       60.0  
   640x480        60.0  

Output from nvidia drivers (100.14.19+2.6.22.4-14.9):

Screen 0: minimum 800 x 600, current 1920 x 1200, maximum 1920 x 1200
default connected 1920x1200+0+0 0mm x 0mm
   1920x1200      50.0*    51.0     52.0  
   1600x1200      53.0  
   960x600        54.0  
   800x600        55.0

-- 
Dual monitor Greeter crash
https://bugs.launchpad.net/bugs/152544
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