I had two stalled slaves in my Monitor. One was running locally, the other on another machine. I tried to mark them both as offline in the Monitor, with mixed results.
The local slave was properly marked as Offline, but the one that had been running on another machine remained listed as Stalled. Checking the terminal showed this traceback:
Traceback (most recent call last):
File "DeadlineUI\UI\Commands\SlaveCommands.py", line 619, in InnerExecute
TypeError: No method matches given arguments
-Nathan