Well, It's a Gerber P2c plotter, using Composer to cut and am running XP. It seems that when I run Cal. Opos. and weed the rectangle the result is a Cal Failed. When I run Cal. Media it tells me "this media cannot be sensed with opos" obviously. How can I get this calibrated to sense registration marks? I am a newbie at this so I must be missing some piece of the puzzle. Thanks.