No sound when USB cable is plugged

Hi everybody,
I'm new in the Virus's world

I've juste bought a Virus Polar but I think I have a problem : when the Virus is plugged on USB, I have no sound. If i use it on a daw or in standalone.

I am on Mac High Sierra last update. On the Virus, I updated on 5.1.7 and I use it with Local on Off. I can only use it with USB deplugged.

I tried this tip but it doesn't work : https://www.virus.info/forum/i…g-out-the-usb-out-on-TI2/

Thanks in advance for your help.

Alex