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Following a suggestion in another thread, I thought to work out and calculate some hatches which simulated perforated plates with a certain percentage open. I calculated on a unit sided hexagon for the pattern repeat, and the holes are 12 sided polygons (dodecagon) to suit, and made a spreadsheet, so that any percentage open can be easily calculated. The process is not automatic so I will not be posting the spreadsheet, but am posting three pattern files. PerfP60.pat PerfP20.pat PerfP40.pat

Are you saving locally or to a network or both? This could be on your companies end, you may need let IT sort it out, I once had issues when they switched firewall software. Maybe they need to check all of the support file paths. I have also had similar issues in the past and using a different graphics card driver (not necessarily the latest) worked.

Not exactly true for newer AutoCAD (2017?). SHX Texts can be PDF comments, which are searchable. How to create selectable and searchable text in a PDF from AutoCAD

Agree "So I'd be assuming recreate each paper copy as a single CAD file", you can always make into 1. Set up stuff like a title block then can copy and paste into each dwg with all the common details filled in. I would scan the dwg we had a A0 scanner, then bring in as a underlay image, maybe play with colors of image if possible, I would use colors like red green magenta as drafting over so make it easy to see what your drawing over. A secret this image was a flat plan and drafted over to demonstrate some 3d software. Make sure ortho is on. For us oldy's use a GTCO 48" digitiser.

Having set up the equations, one can explore further.

I'd typically opt for something like - (nth <param> (mapcar 'cdr (vl-remove-if-not '(lambda ( x ) (= 42 (car x))) <dxf-data>)))