When I want to load my data from my Edge 500 into Ascent, I first plug in the unit and wait until it appears as a Device in the Finder window sidebar. Then, I try to initiate a Sync GPS command. First, I get a Device Removal warning and the Garmin momentarily disappears from the sidebar and the Sync seems to abort. Then, the Garmin reappears in the sidebar and I re-initiate the Sync command. This time, I still get another Device Removal warning, but the Sync continues to completion.
I'm glad that it ultimately works, but I'm wondering if others see this same behavior and if it is being addressed for a future update.