AutoCAD 2008- Zoomed too close to select an object

I am using Acad 2008. When zoomed very close, I can not select/highlight an object such as a line by clicking on its apparent location, instead, I have to try clicking somewhere around it so to select it. The showing line seems an shadow of the real line which is "hiding" somewhere. This usually happens after I played with a drawing (open/close/changing viewing directions etc) for a long time and the drawing seems "degenerated" somewhat. The only way I can correct this is to select all objects in the drawing and copy/paste to a brand new drawing started with a blank template. I guess a system variable governs this effect, but I do not know which one. Anybody can shed some lights on this? Thanks!

Try _REGENALL.

I tried, but it does not work. This bugs me because when drawing a dimension from/to that line, I don't know where to snap to. And the dimension looks odd too because it start or end from nowhere. Thanks though.

Try _REGENALL.

Sounds like you are not in PLAN view, maybe.

changing viewing directions etc

SLW210 I think your on the money Sundancer try UCS W Plan