<shrug> Ionno, it didn't work before, then did after. I believe it was the stock browser when I did it. I've gone to CM7 since then, and redid my entire app collection for the most part (based on everyone's opinions here about them. You all rock, btw.) I'll never go back to 2.1, so I guess I'll never know what caused it to play.
I'm not too familiar with flash and the like. Is it possible that my browser mistook some other type of vid as flash, and then, after I rebooted and restarted, read it right?