CAD drawing issues

[Kilgore Trout]

lines merging with other lines or arcs when I don't want them to

I don't have this problem very often. When I do, I just put the line on a different layer.

trying to move lines or objects precisely using dimensions

This can be frustrating. When the temp dimensions don't go where I want, I draw my own dimension and then delete it when I am done. I also use the transform/replicate dialog to move things more precisely. And, sometimes I use the line/selected line controls in the dialog to move or change things. Lot's of other ways to get what you want without always fighting the temp dimensions.

Further, after an hour or so, the menu buttons for "edit segment", "snap to grid", "snap to object" and "snap to angle" all quit working. I saved the drawing, closed the program and reopened it. I can't get segments to join into poly-lines at all now.

I've never had this problem but it sounds like a problem with "edit object parts" being turned on. If not, I would recommend calling tech support.