I upgraded my machine from 14.04 to 14.10 over the weekend. I have had no issues apart from one which is pretty major from my point of view. The graphics are working horribly ever since the upgrade. I can watch Youtube videos all right but as soon as I make them full screen they become choppy. Playing videos (on VLC) is equally choppy no matter what, to the extent where they're unwatchable.

I see that a similar issue has been raised by other posters but there are no definitive answers. Can anyone help? My graphics card is NVidia GeForce GT 540M