These are 2 bugs that seem to have been with us for a while. Still here in 2.5
OS 10.13.6 iMac 3.2 GHz Intel Core i5
Ableton Live 11.0.12
Expected behavior - Scaler set to sync to DAW and playback to play each pad in order. Internal Scaler sound set to off.
What actually happens - If Scaler is open it will sync and playback as expected.
HOWEVER if the Scaler window is closed playback will play the first pad only and no consecutive pads after that until Scaler is opened again. If internal sound is set to on (i.e. to play any Scaler sound) then playback will be normal whether Scaler GUI is open or closed.
Second bug playing expressions = Scaler produces short notes usually at the end of a phrase that need removed when rendered to MIDI. Usually only 1 or 2 and not on every pad. The make for clunky sounding sequences especially with piano sounds.