How to fix black playback screen on your Mac
If you’re trying to watch NOW TV on a Mac using Silverlight and you’re seeing a black playback window or black window with a white pop-up box, here’s a quick fix:
Go to your dock, open Finder and select Preferences.
Step 2:Under the General tab, tick the Hard disks check box. This creates a desktop shortcut to your hard disk.
On your desktop, click on the Macintosh HD (or Macintosh SSD) shortcut. Select the folders highlighted in the image above, to locate your mspr.hds file:
Macintosh HD/Library/Application Support/Microsoft/PlayReady/mspr.hds file
Tap the cmd key and left click your mouse at the same time. Select Get info, and then rename the file to mspr.hds.old.
Wait a couple of a minutes for your changes to take effect, then sign in to your NOW TV account and start watching. Enjoy.