I've been porting old scripts to mod_perl that use CGI.pm (3.20) and came across a persistent error "Use of uninitialized value in concatenation (.) or string" caused by the start_html function. CGI OO interface was in use with the following params supplied to start_html: title, bgcolor, text, link, vlink, and style. I could not find a way to supress the error. The same code worked perfectly under mod_cgi. Is this a known problem?