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.