Shutter is not working properly on my GH4 Zenmuse. After the power up it doesn't work. But if I change some settings on the camera, it starts to work. But after another power up, there is the same problem.

They are aware of the issues and have a fw in testing

Same here.. no shutter control on GH4..

Someone has said that its due to the AUX1 channel which is not used on the Gh4 gimbal being mid point...  (its used on BMPCC gimbal), if you map a channel to Aux1 and ensure the slider is at min,,, then shutter will work... (I have not tried this yet myself)

Some units are having this issue. I can say my shutter works fine. They are aware of this issues and working on a fix.

I also have the shutter control problem. Is it possible to test the GCU 1.6 beta firmware?

I can now confirm that my shutter works when I assign a channel to AUX1 and set that in off position.

I also tried your option and now mine works! Thanks

Guys, new firmware will fix this. It's coming shortly. Thanks.