The problem: the Youtube app is not working on CM 11 ported on i9070. I go to the app, it loads, I search for a video, results are shown, I open one of the videos, and when loading, prompt: There was a problem in the reproduction. Tap and try again.
The ROM is working excellent! I love it, and I just realized that I hate touchwiz and jelly bean. The ROM works fluidly, has no lags, I love it. Thats the only trouble I had.
As I said my phone is the samsung galaxy s advance (i9070), and I flash the CM 11 from Team Canjica. The kernel version (I don't know if it is the same on every ported ROM) is 3.0.101-CM-gf4e9100.
I thank everybody (especially Team Canjica) and I apologize for my English.