I am absolutely beside myself. The code injection I set up with a great deal of help from neeklamy (http://answers.squarespace.com/questions/19510/need-help-with-javascript-code-embed) has now completely disappeared.
I see the code injection placeholder in edit mode, but when I view any page in my site I see nothing. (Note, it's hard-coded onto the right side the home page, so you see it there)
I have not worked on the site in a week, and I certainly don't touch this code injection piece any more because it's done and shouldn't need any more attention from me. What happened? This is a maintenance nightmare!