Hi!
Has there been a solution yet?
I'm stumbling over similar problems. (Polybrute and Blackbox as Sequencer, either as Master or Slave, Polybrute as VST with Ableton, and further Set Up Options)
Since I'm not sure, whether this comes from the same source of problems:
When using PBC as VST, starting a sequence in Ableton causes the Polybrute to play the sequence, but changing the Preset immediately.