For me, I get black windows! I am remoting into a laptop media server, which used to work fine. However, as of a couple of days ago, I am starting to see black windows for VLC (I hear audio but see no video), Next PVR, and even Firefox and Edge browsers. It's the same whether I use TeamViewer or **bleep**. However, following the comments above, I have just realized that if I open the laptop lid, all the windows display correctly. If I close it again, they go black. So, yes, it's definitely a rendering issue. I wonder if there was something contained in a recent Microsoft update that caused this behavior?