Mac Pro won't use 1920x1200 (VGA)

I have an Asus MK241 with a native resolution of 1920x1200/60hz. It's connected to an 8-port KVM that only supports VGA.
I bought a new Mac Pro and it refuses to let me run the display at 1920x1200. The best I can do is 1680x1050. I have it connected with a miniDisplayPort to VGA adapter. The Mac doesn't seem to have any problem retrieving the EDID.
Using DVI isn't an option. I don't have this problem with my older Macbook Pro running Snow Leopard or any of my Linux/Windows systems connected to the KVM.
For a $10K computer this is pretty disappointing.
I'm all out of ideas.

samberl wrote:
Hold down the option key when choosing "Scaled" in the Displays preference pane and the other non-available resolutions should be displayed, including 1920 x 1200.
Good luck.
Been there, done that, a long time before even posting here. The only additional resolution it gives me is 1920x1080.
I even tried overriding the EDID based on what I found here
http://apple.stackexchange.com/questions/106933/mavericks-not-able-to-use-extern al-display-at-full-resolution
Even though that issue involves miniDisplayPort-DisplayPort adapter instead of miniDisplayPort-VGA I figured it was worth a shot. It didn't have any effect, though.
I did veryify that it works correctly if I use a miniDisplayPort-DVI adapter and DVI cable. But DVI isn't an option, for reasons I don't want to go into here.

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