New to this, so please bear with. While trying to watch YouTube videos, continuously get the "Cannot play video" popup. From reading other posts, I haven't used Wi-Fi, but have full 3G coverage. Not sure what this means, but any reply will help. Also, put some dvds onto my Eris that are in .m4v. Not sure if this is the correct format, but have downloaded a couple of video viewer apps from the marketplace, and everytime I play, it says "Cannot play video." If anyone can please help me, I would greatly appreciate it.