sorry to interrupt the coffee morning, just found a problem and didn't know where to post it)
a block has been used that was at Z=0.0000003 it has been pasted into several drawings
lines drawn from the block are at the odd Z others are at Z=0
the offset is too small to zoom in on in side view,
to compound the problem parts of the drawing have been copy and pasted on, spreading like a virus. The first indication is not being able to pick intersections.
My only solution so far is to quick select any entity not equal to Z,0 but I have to check
line, Polyline, arc,, etc all separately has any one got or know of a lisp routine that will flatten out my problem.