here's a fix for the youtube issue... i couldn't access youtube at all... this fixed it completely for me (although it won't access over wifi... so ok, not perfect... but on 3G... works great, and in fact, get an HQ option - that makes the youtube vids looks 10x better... not HD, but way better than default....)
Youtube Playback Error: SOLUTION - BlackBerry Forums at CrackBerry.com