compact-form-label with search-block-form

Any idea why compact-form-label class isn't being added to the search-block-form in my theme? (Drupal 6.31). Seems to work fine in sites I've built that are Drupal 6.28.

Yes there are posts about this already, but none really give a solution other than to say it's fixed. It's not fixed.

I've added search-block-form id to the list of form ids in the compact form admin page. It seems to work fine in my admin theme which is garland, but it's not working in my custom theme. My custom theme is just a re-worked version of garland. Nothing crazy. No custom js or anything like that. Nothing is changed except the css and the page.tpl.php files.

Any help would be appreciated.