synthexplorer: I got it to work with Ableton 8. I had to use 2 tracks.
I think a Midi instrument can only have midi in?
try this:
Track 1 as a Midi Instrument with Ctrlr_Plugin_VST as the plugin.
Track 2 as an External Instrument and Midi Out going to six-track and
Midi In coming from Track 1.
Both tracks need to have record enabled.