Hi,
My Garmin Edge 530 device goes green in this window when connected via USB cable, but nothing happens when I click on it. The 735 works just fine. I also tried to Add a device, but it cannot find the Edge 530 connected via USB lead.
Strange! Deleted that button, and the app found my device and let me register it. Now working as it should....
Not strange, it's one of the things listed in the FAQ, delete your device and add it again, but glad you've resolved it.