Aux4 port and pwm output

I am having trouble trying to have pwm to drive a shutter coming out of Aux4.

I set the output to shutter and set it as pwm, but nothing comes out (i scoped it).

Checked the safety param and are all disabled.

I am really puzzled.

Hardware is a black Cube on 3.6.6 latest stable

Any help, greatly appreciated.

Did you remember that you get no output on aux if you have not pressed the safety button, if it is active?

Safety button is disabled.

Problem solved. Reset to default param and configured shutter. Now it works, reloaded saved param and still works. Don’t really know what did the trick.

It does happen sometimes. I have chased my tail for days and had things just start working. All is well that ends well.