Is it possible that there are more than one Perl installation on your system, and that you're installing CGI::Lite to the wrong one?

For example: I use perlbrew to install a local Perl. But my system Perl still exists in its original location too. It would be within the realm of possibility for me to configure Apache to use the old system Perl, while everything else I do is utilizing the perlbrew Perl. One result would be that if I install a module that is available to the perlbrew Perl, it wouldn't normally be available to the system Perl.