We just upgraded to SW 2004 from 2003. (Yes, we are behind :) ) When I edit a sketch in a model, the sketch sometimes dissappears. If I zoom in and out for a bit, the sketch comes back *sometimes*, while most of the time I have to exit and reenter the sketch to see it again. Even then, it would dissappear again, and Im relying on the midpoint/endpoint nodes to draw a sketch!! Anyone have any idea what is causing this? Video card is a Nvida Quadro4 900 XGL (6.41.10.6693 drivers)