I have QuarkXpress 6.1 (with the 6.5 update) installed on my Mac Powerbook G4. (Had to reinstall because the software crashed.) Re-downloaded the Full Resolution Preview Extension and placed into my Xtension folder. While it DOES show up as an option, only the LOW resolution option works. I opt for Show Full Res Preview under VIEW menu. When I click on picture and go to the ITEM menu and try to choose the FULL resolution option, nothing happens and of course it looks and prints fuzzy. HELP!!!