ssh-key access works and then fails on new ubuntu install

[Alex Maynard]

I recently reinstalled from ubuntu-gutsy to ubuntu-jaunty.  As part of the
installation process I run some messy scripts to customise a few things, one
of them being to set up ssh-access from my laptop by the ssh key system.
Essentially, I just copy over an old version of sshd_config into /etc/ssh/
and authorized_keys for my laptop into .ssh files for both root and user.

After doing this, user logon from my laptop using the ssh-key worked and
then stopped working.  Root logon kept working.  In the meantime, I had
installed a large list of applications. (I could copy in the list if its
useful.)  Is it possible that one of them changed something?  Are there
files other then authorized key files or sshd_config that I should be
looking at?

I'm a bit puzzled by this and grateful for any suggestions you might have.

Alex
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