I’m one of those who experienced reboots while trying to sign in to youtube account with the previous firmwares.
I upgraded yesterday to the latest version and now I don’t get any content at all at youtube. No top favorites, no videos on search, I always get a message saying there’s no content available (something like that). I’ve tried signing in, it does sign me in to my youtube account but still I can’t get to see any videos on any youtube list. I also tried other regions (Youtube France/German/US) to no avail.