@cmbrowns  after upgrading to Windows 1903, I had exactly the same issue. I found this fix: https://thedigitallifestyle.com/w/index.php/2019/04/23/fixing-korg-usb-midi-driver-issues-in-windows-10-may-2019-update/ The "distilled" instructions are:  Open up regedit (windows key + R,  type in regedit, followed by return), then follow these instructions: The two registry addresses to copy/paste are: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class HKEY_LOCAL_
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