Had a peculiar one happen the other day, maybe it'll help?
Turning Appletalk off using the chooser would NOT release the printer port. I had to turn Appletalk off using the control strip. OS 9.1.
Yes, it showed off, both in the Chooser and in the control strip, but to free up the printer port, I turned it back on using the chooser, then turnd it off in the control strip. Three attempts using the chooser before the work around came to mind.