Products with subcategories wont display.

My website wont display any products that are within a subcategory. Products without subcategories display just fine. When searching for any specific product, It can be found and displays just fine. Nothing else seems to be broken. I recently installed the "Delete Spam Customers" Mod by Author: Scott Wilson, however, I can't be sure if that caused the problem since I had not viewed my website for several weeks prior to that. Also, the website had been running for years without problems.

Select "Handmade Pens" or "Jewelry Boxes" to see and example of the issue when there are subcategories of products under the link.
Select "Tile Top Trivets" to see the display when products are directly beneath the link without any subcategories.

I'm not sure where I should start looking to identify the problem. Any help would be appreciated. Thank you.

https://www.woodworksbytim.com
Zencart 1.5.5
PHP Version 7.3.25
MySQL 5.7.32

Add-ons:
Bookmark_sidebox_1
contact_us__add_subject_V2
edit_orders_1-5-3
testimonial_manager_v1-5-2

Did your host bump PHP up to 7.3 recently? ZC 1.5.5 work with PHP 5.5 through 7.1.

I've got a couple carts running ZC 1.5.5f. When my host bumped PHP up to 7.3, I got lots of log files. When I set it back to 7.1, everything was fine.

All sorts of tghings going on. First, I would fix the partial blank page. Something to do with > <!-- BOF: Display grid of available sub-categories, if any -->is breaking the Jewelry Boxes page.

https://docs.zen-cart.com/user/troubleshooting/blank_page/

dennisns7d:

Did your host bump PHP up to 7.3 recently? ZC 1.5.5 work with PHP 5.5 through 7.1.

I've got a couple carts running ZC 1.5.5f. When my host bumped PHP up to 7.3, I got lots of log files. When I set it back to 7.1, everything was fine.

You may be on to something re the update of PHP on the host. I just checked my archived copy of the php.error.log file. It only had 6 entries prior to Nov 27, but tons of entries on the 27th and 28th. I will check to see when the server was updated to confirm. Thank you.

dbltoe:

All sorts of tghings going on. First, I would fix the partial blank page. Something to do with is breaking the Jewelry Boxes page.

https://docs.zen-cart.com/user/troubleshooting/blank_page/

The pages were running fine for months/years. I made no changes to these particular pages recently. I think dennisns7d may be on the right track with his suspicion that a recent PHP update is the culprit. I'm in the process of trying to confirm with my host provider. Thank you.

dennisns7d:

Did your host bump PHP up to 7.3 recently? ZC 1.5.5 work with PHP 5.5 through 7.1.

I've got a couple carts running ZC 1.5.5f. When my host bumped PHP up to 7.3, I got lots of log files. When I set it back to 7.1, everything was fine.

You were right! Turns out PHP was recently updated to 7.3. I didn't know I had the ability to force my domain to run a specific version of PHP. I set it to use ver. 7.0 (7.1 was not one of the options), everything started working again. Thanks for you help!