Pretty much what the title says, each time WoW crashes or DCes Carbonite resets back to factory. No other addon does this. It wouldn't be so bad if carbonite didn't ship with so much crap enabled by default (travel trails... why? ever? I don't use that one my RL GPS...)
I've had to disable carbonite due to this as the login animations and server queries will DC me when my connection is poor, which sadly it often is.