The most likely problem seemed to be a "puts" because I had a few in the code, but I've removed all of them and it still doesn't work. I've commented out most of the lines in the .rhtml file, thinking that something in there might be causing a problem, but that didn't help, either. Both the controller and .rhtml file are very simple, so there's not a lot that can go wrong. There's nothing particularly special about that page, either, compared to the others in my app (that I can see).
Does anyone know of other possible reasons why all the pages of my Rails app would work except one?
Thanks.