Cannot Launch Cubase AI 9 on OS X


I have purchased a Steinberg UR44 audio Interface. I have downloaded Cubase AI9 and activated the licence.
When I launch Cubase, the program ask which interface to use and recognize the UR44 interface by default but when I select it, Cubase crashes with standard message "Cubase LA AI Elements a quitté de manière imprévue - Ignorer - signaler - relancer.

My configuration: MAC OS X El Capitan 10.11.6
8 Gbytes RAM
USB Driver: Yamaha Steinberg USB Driver V1.9.10

It seems that the problem is the driver because I have tried to start with the interface OFF and then Cubase start.
When the Interface is ON and I launch Cubase, it crashes.

Could you help me ?

Hi and welcome,

Do you have the latest UR44 firmware installed? Did you restart your system after driver installation?

Could you try to install an older UR44 driver?

^^^this. Just needs newest firmware. same thing happened to me. drove me crazy