I suggest you reboot the whole shebang and the try the removal/delete of pending document to print before anything else. If it fails then, then be sure the printer is acknowledged as default, etc., to be active, don't swap USB ports, return to actual port. Otherwise, the printer port resets to #1, #2, start to collect, delete all those and reboot. Now, when the USB port acknowledges the printer(default), then send to print document. This problem is also present to non-networked printers.

tada ------Willy Happy