I have the Ematic media player and DSTV NOW app was working fine up until Friday and then .... "Black screen". And then every time you want to go back into the app it's .... "Black screen".
The only way to resolve this temporarily is to uninstall the update, then reinstall the update but this only works ONCE. So you can watch DSTV on whatever channel you like, but the minute you back out and decide to go to another channel it's "Black screen".
I emailed Ematic and they say it's a DSTV issue, not their issue. However my Smart TV in the lounge has no problems whatsoever when using the DSTV Now app. Works 100%.