we will provide more detailed information in the user manual, once everything is in a more final state.
Since version 1.4.0, you can activate logging by adding the following DWORD (32bit) value to HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors\\pdfcmon in your registry: name : Logging, value :1. This will cause PDFCreator to create an advanced logfile at %Windir%\\Temp\\_pdfcmonLog.txt.
There is some information about registry keys in the manual allready.