After about an hour of troubleshooting w/ProSeries Tech Support (REALLY nice and courteous technician), nothing has changed. My Windows 10 is up-to-date, my PS18 is up-to-date, but I have no printing functions in PS18. Yesterday, the program was working okay, although it has (and continues to have) a tendency to crash about once an hour. But today, no printing to the printer, the print to PDF under the File menu, or the print preview function. The pages that the printing functions produce are all blank, just white pieces of paper or white PDF screens. The technician checked a bunch of things, but ultimately failed to help. I don't know what to do. I guess I'll try reinstalling PS18 because I'm down to grasping at straws. My PS17 program prints just fine, and yesterday my PS18 program printed fine. I may have to try a Windows restore point. Very frustrating. In answer to someone's inquiry, all of my programs and printers are working fine with the lone exception of PS18.