Problem Description

Certain areas of my drawing contain elements with coincident edges, and when I cache that drawing I don't always get the specific edges I want to see.  Therefore the line styles may change from edge to edge.

Steps to Resolve

Because hidden line processes such as Cached Visible Edges have no way to know which edges are "preferred" when multiple elements have coincident edges, some may take priority over others and the desired results may not be achieved.  As a workaround:

1. Change the drawing's Cut Display Style to “Wireframe”.
2. From within the Drawing Model, open the References dialog and copy the referenced Dynamic View.
3. Turn off the display of the desired element's level(s) in the first reference, then in the second reference attachment turn on *only* the display of those same elements.
4. Change the Visible Edge state of both attachments to Cached and/or choose File > Save As V8 DGN with Merge Visible Edges enabled in the References tab and only the Drawing Model selected from the Filter tab > Models dialog.

 This process should allow both set of lines to be created in full with only the desired lines displaying at any given location.