Steve, You were correct the first time..this is a 24-bit color issue. I thought the Sun's I was trying this on had Creator 3D cards (8/24 overlays) but they had 24-bit only cards. I can change enhancement on radars with 5.6j and k on a non 24-bit only display. NMAP2 works fine on either display. Robert Robert Mullenax Weather Systems Administrator Universal Weather and Aviation