I've been having several problems while trying to print (export to PDF) my drawings in Monochrome. I've gone into "Additional Options", while in the Print screen, and selected a few different Monochrome options that I have available. However, my pages still print in color. A while back I discovered the "CONVERTPSTYLES" command and that worked for some time. With this drawing I am currently working on, I've tried the same command but instead it opens up a folder with my saved printstyles and prompts me to select one to open. I get an error reading, 

"(said print style) does not contain a color mapping table and cannot be used to convert drawings. Select a different named plot style table."

This particular drawing has imported drawings and layers. Does that make a difference? Someone please help! The problem is causing frustration at an exponential rate.