Hello,
I am sorry to hear that you have problems. The solution could be to change mode to "Strict" in the Privacy Guard settings.
Click the blue shield with lock on the right side of the browser toolbar -> Change Settings -> Enable Strict mode
If that does not work, the issue may be in a YouTube version that was offered to you. Please let us know the country where you connect from. Also please attach Diagnostic Information that you can find on the browser about page (under "help and about..." in the menu)
Thank you