Quoting Michael Paoli (Michael.Paoli@cal.berkeley.edu):
Well, got the password fine, works find on the talk and admin lists but ... alas, not on the announce list.
Fixed. I had hit the 'Submit Your Changes' button, I swear, but probably didn't absolutely verify that I got a page reload, and on present evidence I did _not_ get a page reload, as the temporary password set by DreamHost Support was still accepted.
This time, I did verify page reload.
No thoughts / candidates for a third listadmin?