bash: /home/username: is a directory

["Robert J. Alexander" <bob@inorbit.com>]

When I use the command "su - username" for any user (root included)
I get the message in the subject ... what is it caused by ??

I am using Debian 2.1 with a few unstable packages, bash

Doing an sh -x of my .profile and .bashrc does not yeld any errors

Thank you. Bob Alexander