Dual monitor question

[the Old Fart]

I have had dual monitors for several months now. I can move programs
from left to right screens & visa versa without problems. I can make
programs fill both screens with one exception. If I were to run video
or live TV on the PC & then try to expand the picture size so as to use
up both screens the following happens. The picture expands from the
left screen only & as I increase the windows size until it expands onto
the right screen. But the only thing displaying on the right screen
will be a black box equal in size to what the video window should be
displaying. If I continue to drag the picture to the right the picture
dissapears from the left screen entirely but it's now 100% on the right
hand screen. Is this normal, that you can't have the video running on
both screens?

Thanks in advance

 

[bxf]

I can confirm that my experience is similar to yours, and the only
piece of information I can add is that it seems to me that
video-related functions appear to somehow "lock" some monitor settings.
I have previously posted some (unanswered) questions that included
comments to this effect.