When you try to edit/delete a document tray, this message is shown:
"The rights "Operator, Owner" must be granted"
The reason for this error is a problem with the Microsoft Message Queueing (MSMQ), which is used for the internal communication.
In such cases the reset of the MSMQ will solve the problem.
How to reset the Microsoft Message Queue is described at the FAQ article 4751 - How do I reset the Microsoft Message Queueing (MSMQ)? - /le/KBA-4751