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Garmin 510 Logging Issues

Recently updated the firmware for my Garmin 510. Also installed the "modern style" Garmin Connect on my MacBook.

When I upload a ride to Garmin Connect I am seeing wildly inaccurate mph stats, e.g. max speed 121 mph and avg speed 8.4 mph. When actually riding outside, the speed being displayed on the Garmin looks accurate. All the other stats - power, heart rate, distance - look accurate. Switching between "classic" and "modern" on Garmin Connect doesn't have any effect.

Anyone else experiencing this?

~Bill

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