The sub and audio track are embedded in mkv file.
With the same file on computer or HD player i can change but not on TV.
While i cannnot change subs i can access the subtitle menu and everything but the TV seem cannot read and display sub
Looking at these complaints in other forums it appears NETFLIX have done this feature removal...... AH's
It is a great feature to check when your stream has diminished in quality for what ever reason.....
Looks like many people are contacting NF in their region to complain..... and so they should!!!