I upgraded to the MacOSX 10.11 El Capitan public beta, and now Garmin Express cannot connect to my ANT dongle.
Garmin Express says "ANT stick is disconnected" even though it's plugged in. When I unplug it and replug it again, it says "ANT stick is connected" for a few seconds, then switches back to disconnected.
It still shows up in System Information, see screenshot:
The ANT stick is a Suunto Movestick Mini, and I'm trying to sync a Garmin Forerunner 910xt.