Hahahaha. I see that I have been humbled by some e x t r a s p a c e s. For the next person who comes along with this issue, here's what Ajeh knew.

This error is usually caused by extra spaces at the beginning or end of a PHP file. Break out your handy text editor and get rid of all the extra spaces before the opening "<?php" mark and after the closing "?>" mark (this is where my problem was - extra carriage returns).

Two things to note about this fix. First, the file you need to fix is the first file listed in the error message (there should be two - see my original cry for help two posts ago). Second, if there are any other error messages that precede the "Header not sent" error message, fix those errors first as fixing them will likely simply make the "Header not sent" message go away.

Finally, I learned that the Zencart FAQs are pretty darned comprehensive, and doing a search on the support site before bugging (so to speak) people here can save everyone lots of time. If you don't know where the official FAQs are, they're at:

https://www.zen-cart.com/tutorials/index.php


So, in summary, watch those spaces, and don't just poke at the links on the FAQ page, use that little Search box at the top right of the page. If you don't, you risk having a buggy online store as well as incurring the wrath of Ajeh.

Don

(Thanks Ajeh - everything works like a champ now!)