This is happening in ALL the games I try now. It works fine at first until I get any Vive lag and my Vive screen goes gray a moment. When in stops the gray all I see is the new SteamVR screen for when a game is having slow down. And it says “Now Playing”. Is there any way to fix this?
There are various reasons why SteamVR may switch to the gray screen. The most likely ones are that Steam VR loses tracking or a frame takes very long to render. The latter can sometimes occur during loading screens or (in open world games) when new data is streamed from the HD. If the rendering is resuming normally afterwards, everything is OK.
The best way to address slowdowns like that would be to install your games on a SSD, which can help greatly with short hiccups especially in open world titles that stream data continuously.
I also experience that consistently. IF I can get any game to start at all with VorpX injection, invariably, the Vive “Now Playing” screen will appear. At that point, there is no other workaround than to close SteamVR and the game.