This is happening for me as well in full screen Win10/Chrome on HTML 5.
I'm not sure if it's a problem on my end or not, but the progress bar overlay menu won't auto-hide when on Progressive and HTML5 modes. When on YouTube mode it does. Also on actual YouTube it will auto-hide.
This is on Win10/Chrome
The same thing started happening to me.
I am also having this problem. It started for me yesterday.
I'm on Win7/Chrome
Me too, This new player they been using isnt all that great.
Win10/chrome and firefox both the same.
I am also having this problem too with the overlay/progress bar not disappearing in fullscreen. Mouse cursor doesn't go away anymore either.
Happening on Win10 Chrome/Firefox.