I’m using WordPress 3.3.2, which is the latest version.
Thank you for your help, and thank you to helgatheviking.
Do you have any advice on staging/sandboxing my site so that I can test these changes before I make them live? Staging WP has always been an enormous hassle, and I usually have to work on fixes while the site is live, which is a less than ideal approach. The other options I’ve tried have resulted in too many problems.