And when you do it via the File/Print menus, is the printer shown the printer you are expecting the print to come out of, rather than anything else?
When did this problem start (i.e. when did you last successfully print a PDF to the printer)?
ReadyDale, yes the printer is being shown where I am expecting the print to come from, I only have one printer. Last PDF document was printed approximately the middle of May.
OK. Just wanted to rule things out.
Just because you know you only have one printer, it doesn't stop the computer from thinking otherwise

Also, was just checking it had been a while since you last successfully printed from PDF (I assume you turn your PC off regularly).
Next I would suggest checking whether the PDF Reader software has any updates. If not, then maybe uninstall it. Reboot the PC. Then reinstall it.