After performing basic troubleshooting, try running the clr_print_queue shortcut found on POS01 & MGR's PC. Launch the icon 3x and wait for seconds each time.
Shortcut is located on the manager's computer desktop but store printing will stop while tool is clearing the print queue.
If the black pop-up screen pauses, press the spacebar to continue.
Open a ticket with [email protected] if you still are having issues.