Stop your NPrinting service and locate your NPrinting "schedules.xml" file. You can move that file to a backup location or delete it. Once you re-start your NPrinting service the file will be automatically recreated with the correct schedules.
Usually that file is located on your server location under the Program Data/NPrinting/Monitor folder.
Something like: "C:\ProgramData\NPrinting\Monitor" , use your own "Monitor" folder path.
I hope this helps.
The issue here was that the new NPrinting service account recently put in to use did not have a dedicated QV user CAL manually assigned to it.
Recently a different user account with a QV user CAL was running the NP server service.
When switching to the new dedicated NP service account. this service account did not have a manually assigned CAL. When this NP service account attempted to open the QV desktop in the background service, it failed to do so because it opened up the QV in personal edition.
Once the CAL was assigned to the new NP server service account and accessed using File Open in Server when logged on to the QV.exe, the locked processes started working normally again.
To all...please see the following article to ensure that you have a healthy running NPrinting server environment.