One of the Roman-8 characters that causes a lot of trouble is the Square Box (decimal 252, hex FC). When you print a document containing this character through Reflection to your attached LaserJet, it is changed into another character. The reason is that Reflection translates most characters into the PC's internal character set, which does not include this graphic (glyph). To solve this problem, use "Disable Printer Translation" in the Printer Setup of Reflection.
To check the Roman-8 character set, look at the back of any HP LaserJet or Attachmate Reflection manual.