Yamaha USB-MIDI Driver Installation and Upgrade (for Mac) 1 Disconnect all USB devices other than the mouse and keyboard from the computer. 2 Start the computer and log in to the Administrator account. To confirm that the Administrator account is available, select System Preferences, then Account (Users). Name OS Size Last Update; USB-MIDI Driver V1.5.0 for Mac macOS 11 (Intel/Apple silicon with Rosetta 2) Mac: 3.1MB: 2021-05-17: USB-MIDI Driver V1.3.2-2 for Mac macOS 10.15-OS X 10.5.

I have just purchased a new iMac 27' i7 to replace my ageing Mac Pro.
The Mac Pro was running OSX 10.11 with the Yamaha Steinberg USB Driver V1.9.10 for Mac with no problems.
The new iMac is running OSX 10.12 with the Yamaha Steinberg USB Driver V1.9.10 for Mac, and has problems with it.
Whenever I power down the Montage, all USB and Bluetooth functionality is frozen or disabled. As I then have no input capability to check or change anything on the iMac, I have to force the Mac to shutdown with the power button and then restart.
Once restarted everything works fine again, regardless of whether the Montage is on or off at the time of restart, or if it is subsequently Powered On. But as soon as I Power Off the Montage, the same thing happens again.
I'm very familiar with Mac's and have tried a lot of ways to solve this, but the only thing that works is to un-install the Yamaha Steinberg USB Driver. Everything then works normally and I can Power Off the Montage with no problems.
The problem exists only when I have the USB Driver installed and am using the Montage as an Audio Interface. FWIW I'm using Logic Pro X, but this has nothing to do with the problem as it doesn't matter whether Logic is running or not.
Anyone have any ideas or having a similar problem?
Thanks.

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