Please restore ability to take a screenshot on iOS with Contour app

It used to be very convenient to be able to bring up the cable news channels on the Contour app, and take a screenshot of news being presented (example, a fire map).  However, this no longer works on the Contour app.

On iPhone 8 running iOS 11, that capability seems to have failed after a recent update - you can still press the screenshot buttons, but it only captures a blank black image. 

Other news/TV streaming apps have not regressed in this way, and I have not applied any OS updates to the phone in many months.  I believe it was a change to the Cox Contour app that updated recently in the last month or two.

I do like the Contour app, it starts quickly, doesn't crash or hang if there is an internet dropout etc.  But if I can't use it to mail screenshots to friends/relatives then I will probably just delete it.

Can you clarify if this behavior is a bug or an intentional change ?

curious,Rob