Did you touch the code or did you turn it OFF in your Zen Cart Admin? :unsure:
When looking at code and thinking, "what luck, I can just change this code here" ...
try using the Tools ... Developers Tool Kit ... and take a constant like the:
SHOW_COUNTS
and enter it into the first input box and select NONE from the dropdown and click SEARCH ...
This will check to see if this is a configuration_key in the configuration table of the database ...
If not, you can also search for its usage or possibly another method of definition where a constant is set in a php file by entering it into the bottom input field, select Catalog or Admin or Catalog/Admin and click SEARCH and it will search all of the php files for the constant, or variable or text or whatever you type into the input box ...