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What statements were missing?

NOTE: the current version from our Home page is v1.3.9h ...

NOTE: just to be sure you are using the new USPS January 2, 2011 C shipping module on post #6 ......

Based on such an old version of Zen Cart, I might suggest starting by going through all of the Known Bug Fixes:
http://www.zen-cart.com/forum/showthread.php?t=82619

then the Security Patches and...

When you are in a Category without Products, you do see the:
*Product is Disabled

and when the Product is marked products_status = 0 (Out of Stock) you will also see that ...