Sorry, we just missed your posts. My apology.
Will take a look as soon as possible. As far as I remember it is essential to have "Allow service to interact with desktop" option enabled as otherwise, the driver cannot communicate with another part - pdfSaver - which generates PDFs.
But it seems there are some other circumstances in your case and will check what it might be.
Tracker Software (Project Director)
When attaching files to any message - please ensure they are archived and posted as a .ZIP, .RAR or .7z format - or they will not be posted - thanks.