Beginner script loads but does nothing – Launch Control XL

Hello!

I’ve just purchased CSS. I’m trying to test my first beginner script.

My issue is the script loads in Ableton correctly, but it does nothing. I’m using Novation Launch Control XL mk2 controller with Ableton Suite 12.4.

Steps:

1. I watched the full walkthrough video and followed “The Basics” section perfectly. In Ableton I’m able to select my css control surface and midi inputs/outputs look good. I used the provided Launch Control XL controller template.
2. I then went to create a basic mapping (by following step 1 here). I mapped knob 1 to device parameter (selected track), and for sanity also mapped button 1 to Play. No logs/errors.
3. Saved + generated + reloaded script in ableton (restarted ableton), and verified ableton status bar says “script is ready…”
4. But using knob 1 or button 1 does nothing. I do however see Ableton receiving midi data when using the controller.

Debugging steps I already tried:

1. Attempted all of the troubleshooting article.
2. Ensured script was saved + loaded properly.

What could be misconfigured?

My only suspicion is controller specific. Since the Launch Control XL has many modes itself (factory vs user), I wondered if the CSS control script only works in a particular mode. But I tried Factory mode and User modes 1, 2 and 8 – all of them behaved the same, none of them worked.

Let me know if I can attach any other helpful details.

Thanks!