So BT have mentioned they found a bug in the latest update and will take a few weeks to resolve.
do we know what bug it is and what problem is caused.
As I'm on the latest Youview (retail) release and BT Vision Player does work (only tested a couple of movies by starting them)
The only issues i've experienced within the BT Vision player are
app can be slow to connect on first start
slow moving within the app
stopping and starting hd movie can cause it to hang on black screen for a bit (stopping and telling to play from start will resolve this)
A number of the most profligate posters from here are in that thread too....but it does give a little more info...well, more than I knew, anyway.