Hi Stefan,
Thx for the advice! I went to Control Panel, under Printers, and noticed an exclamation point on the PDF24 print icon. Right clicked on it, chose Troubleshoot, which then “started PDF24 Window Service” As one of the steps. After I “applied fix”, I did need to reinstall 8.4.1 again... but then everything works great now!!! Many thx!! I will keep this on file in case it happens again!!