Updated firmware is now working ..

1. Make sure the LB FM are up to date
2. Exchange the Master and Slave controller to see if it works
3. Try another phone to check

I tried all possible options, three different transmitter, telephone, tablet, Sony HDMI monitor, the result is always the same - at the second receiver (slave) , only the image that comes to the master receiver.
I really spent a lot of time looking for a working version before you write on the forum that I can not get two different pictures from one transmitter...
Maybe my problem is in Zhenmuse? How else can I test the transmitter?

Just enable "simulateneous image output to app and HDMI" in the DJI Go Settings.
If you enable this option in this app, also other app will be effected to output both HDMI and app video input.

dj_web@list.ru Posted at 2016-1-22 12:49
I tried all possible options, three different transmitter, telephone, tablet, Sony HDMI monitor, the ...

You own lightbridge instead of lightbridge 2, right?
What's  the status of the led light on the Gimbal?