Sometimes when I begin playback for the 1st time, the expression map of some tracks don’t kick in, no matter how long I let the tracks play, nor how many times I play them. The only way to wake it up, is to remove the expression map from the track, and re-insert it. Then it works. Please fix it.
Typically if you place a blank Slot at the top of your Expression Map (i.e. a slot that does absolutely nothing) it will resolve this. You can just add a new Slot to the bottom & drag it to the top. I have a little template I use to start new maps with and it includes a blank slot.