No device found (MAC)

Hi there

Ive trawled through past topics but no actual info on how to fix the problem… When i turn off CC mode the dspMxFX shows the mixer but no feedback signal and then makes a loud buzzing sound. When i turn CC mode on it goes back to no device found.

It then completely froze my iMac which has never happened before forcing me to manually reboot.

When i record into Logic the volume is ridiculously low so thought Id play around with the UR44 settings but with no luck. Really appreciate any help I can get!