FT857, JS8call, Mac

Hi all,

I have a strange problem:
When connecting my FT-857 via digirig to WSJT-X on my Mac everything works just fine.
But when trying to get it to work for JS8call I get the message:
Rig failure
Hamlib error: Command rejected by the rig while setting frequency.

The settings are exactly the same as for WSJT-x.

Any idea?

Do you get a successful CAT test in JS8Call?