Mountain Lion won't allow me to use my display's native resolution.

I have a new 13" MBP with Mountain Lion Installed. I am using a display that has a 1600x1200 resolution, however, when I go into the preferences to change the resolution, it will not allow me to set my display resolution to these settings. I have used this display with these settings on my previous Macbook Unibody. Has anyone encountered this problem? Any ideas on why 1600x1200 is not an option in Mountain Lion?

Check these out. Don't know if they'll help, since I only use my built-in iMac display:
New cscreen posted:
http://www.pyehouse.com/cscreen/
Change screen resolution in Terminal:
http://www.macosxhints.com/article.php?story=20090413120929454

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Mountain Lion won't allow me to use my display's native resolution.

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