Just bought the ur22c and did not enough research obviously. Had I seen these problem reports I would have bought something else.
I have the same problem as many report here - as soon as I install the driver and reboot, the ur22c is not available anymore in the system. On Mac OS Mojave.
…
UPDATE (all my useless complaining removed):
With the help of Steinberg support, who, I must mention honorably, worked and repsoned relatively quickly even on the 30th of december and 2nd of january, I found out that you must allow the yamaha steinberg usb driver in mac preferences “security” section.
It’s stated in point 5 of the mac installtion instructions in fine print.
I told the Steinberg guy after thanking for the solution that this installation instructions could be shrinked to fit the exact product and OS we use it for, and hightlight this thing instead of fineprinting it, so the information is more likely to be found…