Did you try to undo the immunization and then immunize again?
Have you also used the "Check again" function from the menu bar above?
That has fixed it, thank you very much. I closed the browser, opened Spybot, clicked on Immunize, it read zero, then clicked on Check again, it read zero then clicked on Undo and finally clicked on Immunize and now it works fine with everything protected!
Many thanks.