Lars,
I had the same error using Windows 10 and tracked it down to NovaPDF server not automatically starting in windows local services. If you manually start the service the error disappears. 9.2b installs an updated version of the PDF. The error reappears on restarting. I haven't had a chance to uninstall and reinstall AdagioV2PDF yet but expect that might take of it.
Note:
Just ran softrak\system\adagiopdf\adagiov2pdf.exe and it solved my 4380 problem.