As a site collection admin, when I go into subsites and choose "Edit Page", and the "Insert" tab, I see a long list of categories for web parts in the left hand panel. However, when I log in as a "Full Control" site manager, those categories aren't visible, I only see "Lists and Libraries" category.
I've checked this through two site collection admin accounts and both accounts show all web part categories. Full Control users can't see the categories.
Any ideas where to check?