My first suggestion is to restart the computer and see if the problem goes away. (It often happens in the case of problems when printing.)
Does the same problem happen in Preview mode? If not, try Print-to-file to see if the problem goes away.
If not, see if you can edit the RTF file successfully.
I don't print a lot of reports, so I don't have much experience in this area.
I think the free version of PAF Companion allows you to print FGRs from PAF data. But the free version is basically just a Demo version with limited features. The Upgrade version of Companion is $6.75 US and has some nice features. I have used it to print two genealogy books. If the problem persists, consider this option.
I am sorry I don't have a simpler solution for you.