Win10Pro x64 v.1809 Build 17763.557
Acer V3-731 laptop

I watch a lot of tennis on-line since a lot of the good matches aren't
televised on my cable channels. It used to be, if I had a video running full
screen (Firefox 67.0.3 (64-bit)), my screensaver would not start up and
interfere with it. Most of them use the Flash plug-in, and that also is the
latest and greatest version. Recently (within the last 3 or 4 days), the
screen saver starts up after the time set and continues to run until I move
my mouse or press a key, just as it should.

My desktop is one "update" behind (Build 17763.437), and the screen saver on
it
works as it should. Thinking the newer update (KB4503327) may be the problem
(considering some of the other problems that have been posted about it), I
uninstalled it. No change- screen saver still starts during videos.

I could disable it, but that's not really fixing the problem. I seem to
remember
having this problem years (maybe even Windows versions) ago, but cannot find
a fix for it. If anyone has had this problem and could provide a fix for
it, I would
be deeply appreciative. TIA!!
--

SC Tom