This second debug script also works?! and yields similar output.
use lib qw(/opt/rt3/lib/ /opt/rt3/local/lib);
use RT;
use Data::Dumper;
RT::LoadConfig();
RT->Init();
$r = $RT::Handle->SimpleQuery(' Select * From Users LIMIT 2');
print Dumper $_ while( $_ = $r->fetchrow_hashref );