Max 5.1.2, OSX10.5.8, macbook pro
harrumph. Edited and deleted. Problem was due to stupidity on my part.
Though I do get the "MAX_EVENTS_PER_BLOCK exceeded" message from time to time, and would love to know why and how to eliminate it.
And harrumph again. I'm getting the MAX_EVENTS message when I manually trigger notes in a single vst~ synth now.
My assumption is that there's too much info to the vst~ - but I'm only sending a single note on/pitch message for each controller key press.