I have a big Mardi Gras party and my second decks (B) tempo is jumping around. I have downloaded the new update and cannot figure out if the decks tempo jump is from my use of the track pad or a setting with my clocks. What would cause one deck to jump around in tempo even without a track loaded?
To me.. that would rule out a beatgrid problem. I would tend to think some kind of short in the controller - or, some weird bug in the software.
Maybe try wiping Traktor off and reinstalling?