I don't know if it is something to do with the way my PC is set up but printing the tax form is not behaving the same as in previous years. I enter the details and click the left button. That responds that it has found the record, as previously, and I click the middle button. In the past that simply opened the certificate in Adobe. This year it opens a blank pop-up Firefox window and downloads a file called rwservlet with no suffix. It suggests that clicking on it would open it but it doesn't. If I right click it doesn't give me the option to open the file but to open the containing folder. When I click on that option it opens a File Explorer window with the Downloads folder open. Double clicking on rwservlet in this folder then produces a pop-up window asking me what I want to open it with. If I select Adobe it then opens correctly.
Very strange. I just thought I would mention it in case anybody else has a problem.
PS My setup is WIndows 10 Pro N Version 1709 and Firefox Quantum Version 57.0