I don't believe this, Apple has a default app on all it's iPhone that doesn't work properly? Why is there a "Sign in" button, and why is there a "Favorites" tab then? It just can't be!
Anyway, here's my problem: I get a login-error, and I'm absolutely sure that I have the correct username and serial, as I tested it on the computer where I logged in fine...
Maybe it wants my old Youtube data (now you can use it with your Google account), but I don't know that anymore... Any ideas?