Okay, some feedback.

1) Went through each step carefully.
2) Made correct edits to appropriate php files, as per the contents of the latest download.
3) Loaded all up to test site X.
4) Loaded the sql through Admin function.
5) Verified presence of the sql table through MyPHPadmin.
6) Created new category and moved a test product into it.

However.

According to my meagre understanding from reading this entire thread, I ought to be seeing at least one or more additional commands, options, buttons, whatnot on in the Admin control for "Hiding..." whatever.

Nothing shows, no controls, options, anything that can be used to make a category, and thus its contents, hidden.

I have no clue why. All the correctly edited php are in the correct locations, all permissions match those of other files.

Nothing.

I'm using the latest version of the cart 1.3.9h.
MySQL 5.0

I have a couple of other mods on the cart (captcha and shipping related) but non requiring modification of the same php files. So there ought to be no direct conflict there.

I haven't seen any similar experience from anyone here, so either it's my settings or a switch I haven't seen and thrown yet.

Is there some place where you're supposed to switch this thing "On"?

To repeat, yes, I have read this entire thread, and the notes in the package and followed each edit as required, and loaded them up twice and reinstalled the sql twice, and still see nothing new.