When I installed NPrinting 17.1.1, the services now run as QlikNPrintingEngine, QlikNPrintingScheduler, QlikNPrintingWebEngine, and QlikNPrintingRepoService where in previous versions the services were QlikViewNprintingEngine, QlikViewNPrintingScheduler, ... and so on. If you have scheduled tasks to stop/start services or to backup the underlying NPrinting database, double check to make sure that they are executing successfully after you upgrade. You may have to modify the scripts to make the names of the services match the services that are running. To check, open services and right mouse click on each service, selecting properties and checking the service name. This might be different from the display name.
