Drumsteppr mutes buttons not working with Cntrlr

I've been searching in the forum for a while for something related to what's happening to me but can't find any suitable solution even there's no specific thread but I guess someone is having the same problem.

I've been using the Drumsteppr maxforlive device for a while with my Cntrlr and I was very happy with it -using Ableton 8 and first version of the remote script.

But now, for some project reasons, I've moved to Live 9.6.1
I've successfully installed the Cntrlr2 remote script 9.6.1 version (I had to use Pacifist software to extract the files manually because the installer was crashing everytime) and I can use it with Ableton with no problems...in fact I'm very happy with it.

Then I add the Drumsteppr and select the device to enter the sequencer mode.

All works fine except the mute section.

The leds are yellow on my Cntrlr and toggling them also updates the device but I cannot see the change populated to my Drumrack so in the end the mute/unmute is not happening.

Is quite strange because other things are working perfectly.

I've followed all the steps to configure my Drumrack properly.

I've tried prefab Drumracks and I've tried manually and also downloaded the project templates but the same thing happening.

This is my system configuration so far:
- OSX 10.10.5

- Livid Cntrlr (white edition) with the firmware updated to the cntrlr_123 version hex file

- Drumsteppr v2

- Ableton Live 9.6.1 (32bits)

- Max 6.9.10 (32bits) also tired Max7 with the same problem

I've also tried to downgrade to Live 9.2 version but then not only the mute problems...selecting a sound with the 4x4 grid makes no changes on the matrix knobs.

As a quick note, with the last version, I can use the two bottom encoder rows of my Cntrlr for changing each sound params but cannot access the third row...it seems like is displaced and the top encoder rows are still only working for navigating the session.

At this point I don't know what else to try and cannot figure out if is an script or device problem.

Any help will be appreciated because I need to use my Cntrlr as before asap...the mutes function is quite important for playing with my live setup.

Thanks a lot for your time,

Adrià.