Ah, Kevin, as you mentioned it...
I now have the whole cake, Spark CDM with controller, but I also have the same bug as with my prior VDM software - Using Spark's AU plugin in Live gives me the "### IAC Driver (blabla)'###" error in the MIDI out setting, when using the VST plug all is fine. I had a support ticket closed on this with the answer that it maybe an issue with Ableton.
Are you working on a fix or must I wait on Ableton to fix their AU integration???