I am reminded that you can't save authorities from PCF on MQ v5.3, and so even if you set the switch, MS03 can't save anything.
Ah, that would explain it! Thanks for clearing that up.
I have the latest MS03 as of a week or two ago and have successfully run it to output all my queue and channel definitions etc, but now I am in need of the authority information I cannot get it to out ...