I have had a problem with Garmin Connect, since 11 August 2011.
Swim Pace displays correctly on the watch. It displays correctly on individual activity page on Garmin Connect (web).
However, it displays 00:00min/100m on the All Activities summary page on Garmin Connect.
The problem seems to be with Connect rather than the wearable, and only on swim activity. Run Pace displays correctly on the All Activities summary page
Forerunner 935 SW 21.00. Have connected to Garmin and updated to the latest.