I’m commenting here as there has been no response to the thread I started more than a week ago. I’m having very similar issues to those of the others in this thread. I have xkey air, using pro tools 12 on a mid 2012 MacBook w El Capitan. Xkey won’t stay connected for more than a few seconds once PT is opened. I’ve been in touch w Sweetwater and they agreed there was an issue and said they’d reach out to CME. I haven’t heard back from them, I’m guessing because they’ve received no response from CME. Anyway I’m not nearly savvy enough to understand all the tech speak above, but I’d sure like my Bluetooth keyboard to work, and I’d sure like some support from CME customer support. So far, no luck on either of those fronts. Maybe this post will change that.