It looks like your file only includes one station for MLB, so there would be no guarantee that our teams would be available. Also, and to many this is an unimportant detail, my understanding of MLB's licensing is that mlb.com is the one and only authorized internet broadcaster. And they almost certainly wouldn't authorize another site that doesn't authenticate users and required a subscription. Now, like I said, you (and others) might not care if it is or isn’t authorized, and this is just by understanding and not a thoroughly researched fact. But it should be noted that if MLB’s gameday audio still works, it is legal and costs only $15 for the entire season.

I'll report on what I find. In this thread or the other mlb thread I mentioned that it took a couple of weeks to get it to work, so maybe it was just a fluke regresion in their web page. I haven't studied it much on my PC to see if the media is served with flash or with silverlight, which also might contribute to the problem.