Out Of Sync using 800x600 on a TFT monitor

Im getting an "out of sync range" on a TFT monitor after setting an 800x600 fullscreen mode.

1024x768 etc all work fine seems to be just 800x600 ?

Geforce 7300LE - latest Nvidia Drivers
Blitz 1.99

Assuming it's your monitor that's showing the error (ie. not Blitz or Windows) maybe check your Display Settings??
And make sure the 'screen refresh rate' of your 'monitor settings' is set to a rate your monitor can support ?????

Ok - Well blow me down, setting the desktop to 800x600 doesn't work (from control panel) so blitz definetly wont.