Eliya, Thanks for the suggestion to use CGI::Simple. Had not used it before. Changed:
use CGI qw(-compile :all);
use CGI::Simple::Standard qw(param header);
without success. Same results.
Regarding the CGI.pm "-nosticky" mentioned in another post, came across the same documentation that clarify what nosticky does, and does not, do; nice to get confirmation on that, thanks.
Was initially thinking that the issue was with ModPerl::Registry or mod_include, but it sounds like CGI.pm may be influencing the result? Recall that this works as expected when ModPerl::Registry is removed from the equation.
Am wondering if any readers may have time to reproduce the issue using the code/config in this thread, thus eliminating something that is particular to my installation?