negative, i ran into the same problem. i installed RC2 which comes with bad drivers. now i have to download and install RC1 to get a decent resolution.
the last two driver releases from nvidia neglect the 16:10 aspect ratio. you can drop back to 96.33 to get your resolution back.
i also read somewhere that if you go through VGA instead of DVI it will let you. odd problem. should be fixed soon.
*EDIT*
i did read that there is a program called Powerstrip that will allow you to manually enter resolutions. but it costs $30.