OK, we can close this one. Operator error. My httpd.conf file did not have the following;

<LocationMatch "(\.html|\.txt|\.pl)$">
    SetHandler  perl-script
    PerlHandler HTML::Mason::ApacheHandler
    PerlSetVar  MasonArgsMethod              mod_perl
    PerlSetVar  MasonRequestClass            MasonX::Request::WithApac
+heSession
    PerlSetVar  MasonSessionCookieDomain     xx.xx.xx.xx.domain.com
    PerlSetVar  MasonSessionClass            Apache::Session::File
    PerlSetVar  MasonSessionDirectory        /tmp/sessions/data
    PerlSetVar  MasonSessionLockDirectory    /tmp/sessions/locks
    PerlSetVar  MasonSessionUseCookie        1
    PerlSetVar  MasonSessionCookieExpires    1209600
</LocationMatch>
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