I downloaded and plotted both of your drawings and there appears to be no problem.


Re: VBN drawing.  Have you looked at it using the 3DOrbit command or maybe a SE Isometric view?  Your geometry seems to be on two different planes both of which possess a negative "Z".


Re: PBL drawing.  I would suggest you run the following commands on the drawing in the order listed.

Overkill (you have 222 duplicate objects and 362 overlapping objects in your drawing)
-Purge > Regapps (8 unreferenced Regapps)
-Purge > All (1 zero length geometric object)
Audit (1 database error)

Save the drawing and repeat the above sequence one more time.

You might want to run the same procedure on the VBN drawing as well.

I see you have DGN linetypes in your drawings which means that at one time either these drawings were created or edited in Microstation or someone brought content over from MS into AutoCAD.


Edited by John Connor - 18.Mar.2015 at 12:42

You can still do that even today simply by editing your plot style where it says Lineweight.  However, don't you think if the OP used two different plot styles he would have mentioned it?