http://www.zen-cart.com/forum/showthread.php?t=130161
It's simple really. Not easy, but simple:
If a clean uncustomized install doesn't have any problems, then something's busted on your site. So, compare your site against a clean uncustomized install and fix whatever differences are causing problems. Simple. Lotsa work though.
http://www.zen-cart.com/wiki/index.p...Obscure_Issues




