odd problems - phpmyadmin

I just upgraded from php 3.0.x to php 4.0.1pl2. After the upgrade, phpMyAdmin 2.0.5 stopped working, although only in part. Advanced auth fails, but basic auth works (which makes sense). phpMyAdmin does show all the databases and tables on the server, but returns a "No database selected" when I attempt to select a datbase or table. PHP and MySQL do not return any errors. My problem seems to be identical to one posted in early June. You can find it in the archive here: <http://marc.theaimsgroup.com/?l=php-general&m=96039610106444&w=2> Unfortunately, there doesn't seem to be a resolution in the archives. To my knowledge MySQL has not been altered. The terminal client works properly. I'm guessing that it's a php misconfiguration. track_vars and magic_quotes_gpc are enabled. Has anybody ever encountered this problem? Thanks, mh