the Print/Edit Add-On won't print after changing printer properties.

for the past couple versions of Firefox, I've experienced a problem with the Print Edit add-on. I use it often to modify and eliminate unwanted portions of pages before printing. The editing part works fine, but when I'm getting ready to print, I often need to check printer properties to make sure the printer is in the correct mode. If I check properties, the page won't print. I get an error message on the second try saying some of the required printer features are not present. I haven't had this sort of printer problem in any other program. I've tried to track down a cure in the add-on FAQ, but can't find any references to Print Edit. Am I the only one having this problem? I'm using Windows 7 Ultimate and a Canon 4500P ink jet printer.