I've got a Garmin 520 and updated it yesterday with the current version of the software (7.00). I did the first ride with the updated software today on a route with ~2500 feet of climbing - it's what passes for a climbing route in Louisiana. The Garmin under-recorded the elevation change by a factor of about 5; it showed 472 feet. It was also raining for about half of the 3:25 ride.

Has anyone else seen this with the new software update? Would the rain screw it up that much?