the monitor doesn't like 1024*768 from the XRGB2+ either. I've tried another panel (an LG one) and had exactly the same problem :\
All the CRTs i've tried work without a hitch.
Update: I think i've figured the problem out. I'm a PAL user (50Hz) and my panel only supports 55/75Hz vertical refresh. I don't have any PAL60 games to test though
Do panels supporting 50Hz exist?