That's a tricky one if your upgrade didn't change any of those files. I won't be going to version 4 for a while, and probably not with the site that I have the slide out menu on at all, so I won't be much help to you.
The best thing I can say would be to double check and make sure the upgrade process didn't change your categories.php/.tpl files, and once that is ruled out, trace the changes that occurred (or should have occurred) in the upgrade to see if there is something now *missing* from those 2 files that a clean install of version 4 would have. I'd bet there is. See if you can set up a clean install of a test site in version 4, then retro-fit this mod to it's categories.php
If it's smarty only, that's tough. But I have a feeling it's something else.
Cameron
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Current project: 4.4.2
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