"Leon" wrote in message
using SU, have you seen this happen? Occasionally when zooming or panning
part of my drawing will disappear like I cut a section away. Rotating,
panning or zooming will not correct the problem. The permanent correction
is to zoom extents and then go back to where I was when part of the
drawing
diasppeared.

That sounds like a video card problem or related to the image not being
refreshed properly. It might be a SU problem, but it's more likely video
related.