ClickBook does not work with the HP Deskjet 850c printer if you have background printing turned off and you have the ClickBook Setup control panel to "ClickBook active from Page Setup"
If you click the "Use ClickBook" check box in page setup and then print, ClickBook will not take over the printing. The solution is to turn background printing on or set the ClickBook setup control panel to "ClickBook Always Active".