uga-2k-a does not work with my viewsonic VX2433wm display

hi, i have amd radeon hd 6600 video card to drive 2 viewsonic (28 and 27 inch) monitors and i tried to use my new uga-2k-a to link to the 3rd vx2433wm montior. now the 3rd monitor can only support up to 1440*900; if i adjust to higher resolution, monitor will show no signal. I am using windows XP, and the 3rd monitor is using dvi to dvi cable. any suggestions? thx.

For anyone else who is interested: we are currently working to find a resolution and suspect an issue with the monitor.

Jerome.