Two configuration issues...

I have Postgres 8.1 on Kubuntu Breezy on powerpc.  I used the apt-get
to install the package.  The server ran fine right from the beginning
and I had no problems with psql.  I then changed the location of my
data directory and I created a new user.  I can still use psql, but
now I have two (maybe small) issues.

1. When I attempt /etc/init.d/postgresql-8.1 restart I get the error:

Stopping PostgreSQL 8.1 database server: main
Error: pid file is invalid, please manually kill the stale server process

...but the server starts up just fine.  When I look at current process
I find four postmaster processes.  I don't really know how to describe
it, but it looks like one lead process, two sub-processes, and one
sub-sub-process.  Is this a problem?  Did I forget to do something
when changing my data directory?


2. My other problem:  When I am running as a non-root user and I type:
$ su postgres
I'm asked for a password and no matter what I type I have an
authorization failure.  Now, I assumed this would be the password I
created for my superuser when running initdb -D.  Is there anyway to
figure out what this password is or to change it?  Or do I need to
just accept that I need to do su root before I do su postgres?

Thanks for any help or suggestions.

-eric