Print Styles

I have tried selecting Format>Print Style... and I get the following message:

 

"Print styles are mapped to an entity's color when using color-based print styles.  Change the entity's color to change the print style."

I want to edit the monochrome.ctb file and after clicking "OK" to the message, nothing happens.  It goes back to the selection tool.

Is there a way to modify the monochrome.ctb file?  Is this a bug in this update?

I'm using Windows Vista, Draftsight V1R1.2.