I've noticed since updating to (OSX version of) 2017.37 that I need to go to the Layout and change specific models colour to "Apple" colours because they do not display on the visualizer screen otherwise. I haven't had to do this to all models, only some. I've looked through the settings of the models and they all seem to be consistent with the others. It wasn't until I changed the colour to an "Apple" colour that the issue corrected. This hasn't caused any crashes and I don't know if it would cause the controller channel to appear as unresponsive, I haven't gotten that far into sequencing yet since I'm still just dumping the ideas into the sequencer right now.
I've attached the video and .xml for reference
Thanks