CGM version & profiles

After exporting a cgm several entities appear in grayscale rather then black when viewing in Corel X5 (customer's viewer). Random versions and profiles selected within the export preference of Abortext ISOdraw 7.1 had the similar results. However, a local install of Corel X5 did not replicate the same issue. Is there a version & profile match which forces all cgm viewers to display all black no grayscale? Or I,m open for other suggestions.