Tried synching outside of the class today, but I was only 6 feet outside of the door, so it was still giving me 'multiple sensor units'. I found one teammate with a garmin, and he's never had trouble synching. We guessed that it was because his has been synched before, so it was easier to lock onto his sensor.
OakLeaf: Definitely worth a try. I left the bike in the team bike room, so I'll have to try that the next time I'm up there.
'You can't always get what you want. But if you try sometimes, you'll find you get what you need.' - Mick & Keith