Why can't I change a password

Hi all,

I've somehow messed up something.

psql super
psql (8.4.5)
Type "help" for help.

super=> \du+
                   List of roles
 Role name | Attributes  | Member of | Description
-----------+-------------+-----------+-------------
 bobo      |             | {}        |
 junk      |             | {}        |
 myuid     |             | {}        |
 postgres  | Superuser   | {}        |
           : Create role
           : Create DB
 slitt     | Create DB   | {}        |
 super     | Superuser   | {}        |
           : Create role
           : Create DB

super=>
super=> alter user myuid password 'mypass';
ERROR:  permission denied
super=>

I don't get it. User super is listed as attributes Superuser, create role and
createdb, so why the lack of permission? This also happened when I was in as
"postgres".

Interestingly, earlier tonight I was changing passwords just fine. I don't
know what happened. Obviously there's a chunk of information I'm missing.

What diagnostic tests can I do to narrow this down?

Thanks

SteveT

Steve Litt
Recession Relief Package
http://www.recession-relief.US
Twitter: http://www.twitter.com/stevelitt