so though reinstalls, different GFE's etc, I have narrowed it down to wake on lan causing the issue.
I.e. If I WOL from my phone, pc starts, steam streams to Mac, doesn't stream to Pi (black screen, doesn't kill back to emulation station).
If I then put to sleep and wake with kb/mouse, it works as it is supposed to...

Any advice how to have WOL not screw with moonlight streaming?