All slash notation in this project is represented this way in Print Mode:
Make sure ‘View options’ is switched off in the Annotations section in Print mode; if you do want to print the region behind the slashes, at least make sure you print in colour rather than in black and white.
That did it! Thank you, Daniel. And thanks for changing the subject line. This happened when I was printing parts for an immanent rehearsal and I was a bit anxious.