Hi! I had the same problem but now its working Just Fine. This its what I do.

First update the latest version of PT 11 (In my case PT 11.3 - Restart
Then UNINSTALL the 11R Drivers - Restart
Then Instal the 11R drivers Again. - Restart.

And Now Everything works perfect. I can heard the audio through the 11R (iTunes, Youtube, Etc)