Has anybody idea why I'm missing multiple layers in PDF export?

In layout tab view everything is visible as they should.

Same problem with Print -> Save as PDF. Everything is fine in print preview but in final file multiple layers missing.

I've checked from layers manager that all layers have "Print" allowed and "Printstyle" normal. Viewport overrides list is empty.

Any ideas where to check, what to reset etc...?

Draftsight 2019 SP2 and now SP3.. Same problem.  OS/X 10.15.1

Update 21.12.2020:  Export to JPG outputs all layers as expected.  Unfortunately resolution in such raster image is what is it.