I have a MacBook Pro mid-2010, 8GB RAM, latest version of OS X. This morning I installed Garmin Express as I saw it now supports my two Garmin devices.
I have restarted the computer since installing Express just in case this makes a difference.
With the Edge 305 connected over USB, Express 3.2.6 claims "No device found."
With the ANT+ stick connected and my Forerunner 310XT turned on and nearby (indeed, exactly where it was when I uploaded a workout with the ANT agent twenty minutes ago) I get the same response from Express.
Any ideas?