The result of using CGI::Carp was that the config.pm file did not return a true value even though I had a:

1;

line at the end. I then changed the line to:

return 1;

and all worked fine. Is this a requirement of Perl 5.006? or should one always use:

return 1;

Thanks for the CGI::Carp suggestion, we did not have access to the error logs.