John,
I think you will find the problem is with the latest version of Adobe Flash Player 32. The print function was working fine for me until my latest version was auto installed on 8th February.
It looks like nothing is happening once you click OK on the print dialog box but if you pause printing in the print queue and try again you will see the print job spool waiting for the printer to be un-paused. The moment you un-pause the printer the job deletes itself from the queue.
A work around is to to select Microsoft XPS Document Writer as the printer when the print dialog box comes up and print the page to a .xps file. This can then be opened and sent to the printer. I looking at how to uninstall version 32 of Adobe Flash Player and go back to version 31 with the auto update switched off.
I am running Firefox on Windows 7
regards
Graham S