I also unfortunately upgraded and have lost my Ayre QX-5 USB DAC. I am running Roon on a MacBook Pro 2012 model. This is clearly a problem caused by the upgrade. I was run Roon through my QX-5 for 2 hours this afternoon and noticed the upgrade available message on my screen, After upgrading, I could not find or connect with the DAC. Whoever is responsible for these upgrades at Roon should do a better job before they release upgrades. Roon is a software database company and apparently is not very good at implementing its sole function.