ah i haven't changed the state of the default button, but i think Justest hit the nail on the head: my main screen (on machine1) has a resolution of 1680*1050 when my slaves (on machine2) have 1/4th of that (800*500).

hum, does that mean i need my slaves to have a 1680*1050 reso as well? not sure my second machine will handle 4 of that.