Hi.
I have the same problem as many have had before me. My newly updated Edge 500 (software version 3.30) is reportedly not compatible with Garmin Express (latest version - no updates available). I've tried to do a master reset to no avail, and also multiple reboots and different orders of starting the software, plugging in the Edge and so on. I also remove the GarminDevice.xml file a few times, although it never looked corrupt. I am on Mac OS 10.10.2.
Please advice.