The new Category buttons a) don’t bring items to the top of the page and
b) don’t properly highlight all of the items in that category.
For starters, they should do more than merely highlight items, they should work like the Search box used to, hiding all items that are not in that category and bringing those category items to the top of the screen for easy reviewing.
Second, even this new inferior functionality is not working. I have two treasure items at the bottom of my inventory that are not highlighted.
[Edit: Apparently the server I was on was in the process of going down. Now that the server is back up the items in each category are lighting up appropriately when clicking the category buttons. Go figure. With that said, the first criticism still stands. The buttons should make all other items hide and should bring the items in that category to the top of the screen.]