I found the Problem...
It works fine when in "regular screen mode in you tube.
but when you are in theater mode < this is when the screen is only 3/4 fixed.
if you goto settings / Features / Lucid mode and use the slider to use 3/4% instead of 100%

@leocg

Thanks for the reply .. I did the update .. and still has the problem ..
However after playing with it for a bit ..

if you goto settings / Features / Lucid mode
and use the slider to use 3/4% instead of 100% that seems to " fix " the problem.
if the slider is at 100% is when is only works on 3/4 of the screen LOL
Not sure if it fixes it really .. but at least its not as noticeable !
Very strange I know ..

@leocg

Yes the hole window ..
I guess .. lucid is only working on 3/4 of the video windows size.
as you can see that is a you tube video .. and lucid is working on the left side.
( blow up picture )
but on the right 1/4 it is not .. weird .. not sure whats up with that .. seemed to work fine.
maybe one of the updates ?

Lucid mode not working on the hole window ???
it seems it only works on part of the window. maybe 3/4 ?
any idea how to fix this ?