PDFCreator Server processes Jobs only after restart

Hi,
I‘ve got the Problem that the PDFCreator Server (Version 2.3.2) processes the Jobs only when I restart the Service.
The Service is running and no Job is processed. When I stop the Service and start it again, all the jobs in queue are processed. When that’s done the Service does not react to a new job in Queue until I restart the Service again.
Where is my error? What do I need to change?

Regards, Chris