I have vesa modes up to 1600x1200x256 available to me, but the only ones that work are 640x480x256 and less. I think this may be because my LCD monitors won't support the requested resolutions, or at least that fractint can't make the resolution change happen. I even tried setting XP to 1600x1200x256 before running Fractint. I am running fractint full screen. I have long since gotten rid of my last CRT multi-sync monitor.
So if folks would care to share your fractint environment, maybe share the monitor also. I'd be interested in operating system, graphics adapter, and monitor. Anyone successfully using an LCD monitor?