Display does not light up on 10.6.4

[luvcraft]

I am using your newest MAC beta drivers 1.6b2 trying to get a 1920x1080 Version of your UGA up and running. The system used is OSX 10.6.4 on a desktop Mac.

Here is what I did so far:
First I have installed the 1.5 version of the driver and rebooted - I saw three displays in my system preferences monitor section. The to displays connected to my VGA board are working fine and also the third display, a Hanns.G HW191D was correctly recognized by the driver. No matter wich setting I used the display kept saying "Input signal out of range". I checked both a new DVI and a new VGA cable to make shure the problem was not on this side.
Next I installed the new 1.6b2 driver to the same result.
Now I de-installed, fixed the permissions of my hdd, rebooted and re-installed the 1.6b2 driver. Noe the third display is simply called "Display Link 1" but still does not light up.
The interesting thing is that my desktop space is properly enlarged - I can move the mouse into the display's range - I just do not get a picture.

Any advise?

Best regards,

Cris.