I had downloaded MxTube and downloaded a couple of videos, then I tried to view one, and the app immediately crashed. It did this everytime I'd open it back up and try to view any of them. So then I downloaded Yourtube 2 and downloaded a couple videos again, and the same thing has happened (immediate crashing upon attempting to watch one). Any ideas on what could be wrong? I'm running iOS 4.2.1 tethered Redsn0w JB on an i4, if that helps.