I really don't know what's going on with Express. It generally takes me about an hour of futzing around to get it to sync my watch (410). Just now it took 7 tries, some ending with "Error - cannot find your device". Some with "Error uploading to Garmin Connect". And now my favorite - Express says "The Passkey Cannot be found, please pair again", and yet despite this, it is now syncing.
ANT Agent finally became stable, and then Express comes along and is awful. We have two Macs, two different ANT sticks, two different watches (a 405CX and a 410) and have exactly the same problems with both. Is there anyway to make this thing work better?