I just noticed this a few days ago. I would go and watch some MP4 videos online at times. Just go in Safari and click the video it would load it up and stream it directly. Now I do the same thing on the same sites that I have always used and it shows up with loads of random characters. A lot of random text which looks like the video header, but it won't play the video. This is on a iTouch 3G firmware 3.1.3, spirit jb'ed.