Rooted N6 on 7.1.1 won't successfully connect Miracast

I rooted my Nexus 6 yesterday and added the mod to the build.prop to enable Miracast. The mod appears to have enabled it, but I can't get it to successfully connect to anything. I've tried on my Samsung TV and Roku stick. It'll say "connecting" then says "connected" but at that point my TV just goes back to whatever mode it was in before trying to enable screen mirror, and my Roku doesn't seem to react at all.

Thoughts?