Weird print issue

Greetings! For internal use, we quite often print to our black & white laser rather than the color printer. Using Corel X5, it's coming out weird. For example a black rectangle with white text over, prints out as a grey dithered box with black text? Printing the same thing from another program prints correctly. Any ideas or suggestions? I assume it is a setting in Corel, but what?

 

Thanks - but no, definitely not that. Even creating a simple test page produces the weirdness. If I have two identical lines of type, set one to black (C0,M0,Y0,K100) and the other to white (C0,M0,Y0,L0) they both print black!

 

Yes, looks correct on screen. I'm going to see if there's a printer driver update to try, although it printed ok from a different program

 

I'm convinced it's a weirdness between the printer and X5. The same file printed via X3 comes out fine, as well as via Illustrator.

Anyhow, after a bit of tinkering I solved the issue using the Canon XPS driver instead of the regular Canon one - just in case anyone else has the same problem.