The YouTube PS3 App is currently not displaying any videos however they are hard at work bringing it back up. The best place to address questions is to go directly to the YouTube forums located here:
I will be closing replies to this thread, so you're welcome to Subscribe to it and receive updates when a SCEA rep responds.
Otherwise, please direct feedback to the above thread, or feel free to start a new thread to discuss the issue in the PlayStation Community.
UPDATE 1 2/8
- The app should now be working normally.