Webmin dies on startup

[Jonathan Melhuish <jon@netacclaim.co.uk>(by way of Jonathan Melhuish <lists@netacclaim.co.uk>)]

Since upgrading my system on 10th July, webmin hasn't worked.

When I try running "/etc/init.d/webmin start", it says "Starting webmin:
webmin" and returns control to the command line - but no processes persist
and no ports stay open.  What's more, I don't even get any log output
in /var/log/webmin/webmin.log or /var/log/messages.

I usually run the stable version, but I have also tried installing the testing 
version, to no avail.  I have tried removing and re-installing both versions.

Has anybody got any ideas?

TIA,

Jon