It seems that having USB cable connected to the Ronin S5, Ninja V and Lumix S5 means that the back screen doesn't show any picture. I have to take out the USB control to get it working. It seems that trying to use remote control over the Lumix Sync app has the same effect. Is this a known issue?

So basically you only have the option of HDMI > Ninja and back screen, OR USB> S5 and back screen. Pretty lame I think..

I have the same issue - is there any workaround?

I have the same issue - is there any workaround?

Sadly this issue has not been resolved. Basically you can't use the remote control for the S5 if you are using a Ninja...   Don't know if this is the case for the S1h or other Panasonic cameras?