Hey there,
I have issues with Solex and video streaming as well 
Air and Remote Unit flashed to the newest version, using a GoPro 4 Black.
If I start Solex first, then turn on the Air unit and afterwards connect the running GoPro to the Air unit nothing happens (LED1 off). After I start QGC, it takes 4 seconds and the video stream starts (LED1 Green).
However, if I go back to Solex I still have no video…
Update: After removing the touchscreen of the GoPro, LED1 turns green after starting Solex. Still, livestream is not working. I have to add that no autopilot is connected yet.