Hi, pshin, did you find a solution? I'm having a -maybe- similar problem.
I've been using PDF24 8.2.4 to generate PDF files in a fixed folder from a program. It has been working fine for about two years in computers with Windows 7, 8 and 10.
Today I found problems in a Windows 10 computer, the PDF files do not appear. The setup is the same as in the other PCs. I tried printing PDF files from Notepad or Word and it does not work either.
I've reinstalled, uninstalled, updated to PDF24 8.4.1 with no luck.
The service is running, in Task Manager I see two pdf24.exe instances. I tried killing those instances and restarting the service, everything looks fine, but the PDF files do not generate.
Finally I changed PDF24 Configuration in order to open the editor instead of generating a file, sent a Notepad to the printer and the editor opened but the text does not appear in the right window.
Thanks in advance for any ideas.