Thanks, Magus. I did more digging and now I feel stupid...it wasn't a problem with the buttons at all, I had the "Highlight Existing Fields" option turned on!
However, is there a way to incorporate your idea in a button? It would be cool to have borders around the fields until the user is ready to finalize, at which point the borders could be hidden. I messed around a little and couldn't make it work but I'm far from proficient with scripting.