Thanks for your help, Chuck.
I checked my admin panel settings.
This is the setting that I remembered: "Display unapproved reviews? Yes"
I see that the process for displaying an unapproved review in the category pages and indexes uses different script.
That's o.k... I can live with that
Just a note: I think that the number of last reviews setting is off by one in the script, because when I had it set to 5, 4 reviews displayed, and when I just set it to 6, 5 reviews displayed. (That's not such a big issue, but you might want to adjust that in the new RP upgrade).