iTunes With Apple Music No Video Playback

For a long time im away from Windows. What is great. Thanks to "tonymac" for all the tools and the forum.

Now that I am in the Apple cosmos I decided to buy the software I use from the App Store. Never had any Problems.

Listening to music is one of my pleasures. I purchased Apple Music and I am happy with that so far.

Inside iTunes there are many Music Videos I would like to watch. But I cant get them to show. The window for the Video shows up. Only a black screen inside iTunes with the navigation elements. It seems the video is loading. I can see network activity. 11MB/s for about 10 secs. Someting is going on. But no Video is shown. I have tried to download the video with the "cloud button". That works. But still the video is not to see. Also the progress marker is not moving. Press on play or pause makes no difference.

Since I own more than one Hack I tried it on all of them. No chance. Two are with MacPro SMBIOS for MacPro Late 2013. Both with dedicated graphics. One with GTX970 one with R9 270x. Also my Hack Mini Server SMBIOS 6.2 with onboard graphics shows no music video within iTunes. HD4600. I dont belive in a graphics issue.

Quicktime is installed with OSX El Capitan witch is running on all my systems. 10.11.1

If anyone can give me a hint I would be very happy.

Thanks for reading and your help in advance.

It seems protected video content only plays on BUILT-IN monitors on Macs.

My hack has an integrated hd p4600 and a discrete nvidia card. I can't play any purchased video in iTunes if I only use nvidia card (with nvidia web drivers). Anyway, if I boot with the integrated hd p4600, I can play purchased video in iTunes, but only audio works, no video playback. I guess this is something to do with HDCP.

That seems to be a very good point. I'll see what to do. Maybe a solution is near.
Let you know. Thanks for the hint.

Any solutions update?