Err...you say that you cut J12? I never got around to doing a lot of Datalogging with Uberdata, but I know for sure with Crome you cut J12 to datalog. And for Uberdata you do not cut J12 to datalog.

IIRC all you do is open up UD and load up a .bin, you dont have to "enable" anything. You just need to have the engine running or the ignition to the ON position so that the ECU is getting power.

From what I've read of UD you wanna have one UD window open for datalogging, and you open another one with the actual .bin that you make your fuel and timing changes to. So open up Uberdata twice and use one for logging and the other for tuning.