Test site loaded with 1.5.7d, new DB, and following mods:
Edit Orders
OPC
Sitemap XML4
Clone a Template
Bootstrap and Colors
Display Log Files
Mod List

Removed and replaced DB with the old. Weird that it showed up during upgrade as 1.5.3 although site's current version shows 1.5.1.
Had to make the usual changes for utf8, dates, password lengths and a couple of changes to constants in the database (adding the missing default currency variable to AIM was one. The other was a change in a variable name I can't recall at the moment.

Countries table was, of course, a problem that we worked around by pulling the 1.5.7 table into the old DB when copying it to the new test site.

Finally had everything rocking along until we tried to update a category description. CKEDITOR will not save html formatted text for a category description. You can directly enter the html code into the database and it will appear properly on the page. If you then go inot the admin to the category's description, you will see the output and the correct html when Source is clicked. Clicking on source again, shows the formatting result but, when you click save and go to the storefront, the data is gone totally. No partial blank page. Just gone.

Going back into the admin and that category's description, if you do NOT click source, enter Hello World, and save, it will show up in the storefront. Also, when you return to the admin and that category description, clicking on the Source button will show that the Hello World is actually saved as html-formatted text. Hello World is saved as <p>Hello World</p>.

Several threads in the forum address this along with listings of CKEDITOR problems with other venues.

https://www.zen-cart.com/showthread....aving-in-1-5-7

https://www.zen-cart.com/showthread....fering-formats

https://www.zen-cart.com/showthread....-in-ADMIN-SIDE

https://www.zen-cart.com/newreply.ph...eply&p=1330466 suggests replacing the old 1.5.1 admin/includes/ckeditor.php with the 1.5.5 version. That fails to fix the problem.

There's a discussion on stack overflow as well. https://stackoverflow.com/questions/...on-server-side

Any thoughts on the matter are greatly appreciated.