Are you exiting the script after you run it?
Sorry I can't understand, this is my python scipt (two lines... is a test):
from mystic_bbs import *
writeln('just a test')
menucmd('GI')
When I invoke it with GY from a menu entry I see Just a test but nothing else happens.
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La violenza è l'ultimo rifugio degli incapaci!
--- Mystic BBS v1.12 A48 (Linux/64)
* Origin: REtrogaming ACTivities (REACT) BBS (2:335/601)