Chuck - OK, your comment above really had me nervous. I know I deleted all the Classified tables from my database before I installed. If somehow there were some remnants of the previous install such as the version in the cright value, than what else could there be that would cause problems later on? Well, before I went to far I looked through your install.php script for the 4.0 Beta 3 and sure enough found this line:
$query[] = "INSERT INTO {$pp_db_prefix}settings VALUES (37, 'setting37', 'cright', '<font size=\"1\" face=\"verdana\">Powered by: <a href=\"http://www.photopost.com\">PhotoPost Classifieds 3.21</a> --replaceme--<br />Copyright 2009 All Enthusiast, Inc.</font>', 300, 0);";
So I now have a warm and fuzzy about my database again.