Menus can get messed up after saving or quitting
To reproduce: load save, talk to hawkslayer and give him the "iceberg" password, then save. In ASCII, the subsequent game menus are not displayed (see attached screenshot).
EDIT: Saving after viewing monster memory also messes up the menus in a similar fashion.
EDIT2: Seems to happen randomly in other situations as well. Also happened after pressing 'e' on the end of game menu.