Selenium test on a GWT app - request not sent to server
Okay, I found the answer. It's a little embarrassing, but it provides the answer and it's funny, too. I'll share the answer so that you can avoid the problem, and perhaps have a laugh at my expense. :)
The answer is that you have to compile to OBF instead of PRETTY. All the associated links are listed below. They fully explain the problem, and how to avoid it.
What's funny about this? Well, as I was going through search, I finally hit upon the first link below. Almost immediately, I realized, or at least had a sneaking suspicion, that I had solved this problem before. Sure enough, the original question was posted in October, and I was the poster. So, I got an answer before, and completely forgot. Ah, well. Hope the answer helps someone, and my comic misfortune brightens your day.
http://clearspace.openqa.org/message/50170
http://code.google.com/p/google-web-toolkit/issues/detail?id=2861