Xserve's mini displayport (dvi to vga) not working with snow leoapard

I am using a Acer 20" display with the mini displayport to vga. and since I updated to snow leopard it is not working anymore. If I change the resolution it is recognized but it is a very bad resolution and as I have a wide screen the resoltion that works looks horrible.
I saw that the update 10.6.2 had some updates including mini displayport problems, but it seems like it did not fixed the problem that I have!
I tried to call the apple support hotline but I got kicked out twice after the agent asked for my serial number and online I could not find anything that could help me to fix my problem.
so if there is someon out there with the same problem or an idea how I can fix that problem I would be very happy!
greetings from spain / barcelona!
cheers!

If there are listed options available, changing the refresh rate of the display frequency in the Monitors preference pane will sometimes yield better results at given resolutions.
I have to Xserves connected via a KVM switch to a CRT monitor; one Xserve is using the DisplayPort/VGA adapter, the other is straight VGA from the video card. I had to fiddle with the refresh frequencies to get the images to come close to matching.
-Doug

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