Actually, I just noticed a discrepancy between the two Buttons: The WADA Search sequence that works has an "any form post" trigger while the other one doesn't. The problem now is that both CS6 and CS5 crash whenever I try to change the trigger to "any form post" in the bad page.
I tried changing the code - if ((isset($_GET["Search_x"]) && $_GET["Search_x"] != "")) { - to - if (isset($_GET["S_name"])) { - but it does not work either (the latter seems to work with the good page).
Please note that the Results Page that doesn't work is a modified copy of the one that works.
Just in case, attached please find a copy of the page in question