CSS2.6.3 + Live 11.1.5 – can’t get it to function

Hi. I’m using CSS 2.6.3 with the current version of Live (11.1.5) and am not able to get my remote script to control Ableton as desired.

I’ve been working on the FCB1010 template and have assigned all the MIDI CCs and Notes to my buttons with Midi Learn On in the Controller Templates page. I’ve then created a simple script following the tutorials and installed it properly (shows up in Ableton).

The thing is only the metronome on/off function works, but volume change and track select don’t do anything.

Is there a problem with CSS2.6.3 + Live 11.1.5, or must I be doing something wrong? I’ve tried and tested everything that comes to mind, but Ableton just does not respond to these commands.