I just registered on infekted.org so it's a late reply to this thread - but hopefully a useful one.
I've used Live 7 on a G5 PowerMac, and now Live 8 on a MacBook, together with a TI Snow. v3.0.3 software, OS 10.5.7. I experience this exact problem on both setups. My solution is to disable Ableton's Delay Compensation (Options menu) during MIDI recording to the TI - then I get pretty accurate timing. Playback timing is never an issue, regardless of whether Delay Compensation is enabled or not.
I'll shoot off some emails to both Access and Ableton - let's see who blames the other first...
