(I posted this on the old forum, but after reading that you are folding that into this area, I am posting here as well. Sorry for the redundancy.)
I upgraded to the latest version of JetPack and WordFence stopped working. I cannot see anything in Live Traffic. But the moment I deactivate JetPack in a different window the Live Traffic snaps to the screen with its output. I can replicate this reliably.
WordFence version 4.0.1
JetPack version 2.8
I have most of JP features not activated, I use a select few and can list them if you like.