I can attach a pdf and it will display fine at full image size, but if I zoom in to trace outlines it will blur to the point of being impossible to see, I have to scroll the mouse wheel up and down to try and find a point where it will come back into focus. When it has and I'm panning accross the dwg it will disappear completely, then I have to zoom back out to force a regen. Using pdf's as a base on which to trace is useless, jpgs are ok but the resolution is not as good and snaps won't work?