In plan view, I have 3d conduit drawn but part or all disappears and if you look at the same area in iso view or front view, it is there. If you move your cursor over where it should be, there is one white dot apparently to represent the pipe connection and if you windowcross to pick where this pipe should be, the grips show but still no pipe. Sometimes if you move this pipe 12 inches over and back, it will show up and stay showing. However, that is not always guaranteed so when plotting, these entities are not represented. All pipe is connected and my system is XP Pro Dell precision Xeon 3G CPU with 3GB RAM.
Thanks in advance for some direction.