Connecting straight to Mac. No third party app.Are yiu using Commander 1 or just plugging the XT straight in? My XT will, of course, connect through Commander 1. But that requires the downloading of the Commander 1 package.
Occasionally you have to ignore it and click "update" even though Express thinks it's not connected I've found. It finds it then. Basecamp will be showing it fine and downloading/uploading.
Or the old one of pulling the USB and plugging it back in.
Its yet another known Garmin issue.