[SpartanValor]

Well, as mysteriously as it happened, the problem has seemingly been solved. I uninstalled NexDef, then clicked on some link on mlb.com regarding NexDef, and saw a link to the Autobahn service that runs it. Decided to click on it, and downloaded it manually, even though it said it was already installed. Clicked back on the 1.2M link, and got a pop-up blocker-type warning that said "intranet settings are now off..." so I clicked on it, and said "turn on intranet settings". This gave me a warning saying that these settings are less secure than internet settings. Clicked it anyway, and got the video to seemingly play on 1.2M. Crazy. I guess it was just a security issue (of course), but it was like an act of God that caused that task bar to popup, for whatever reason, and told me to turn on intranet settings.