Thank you very much for replying quickly, much aprpeciated.
Sorry for the late reply but I have been caught by work.
Strangely this does happen only when I use one specific user on my laptop (the one supposed to be used only for music) but if I run max on my “work” user there is no issue with button brightness.
Also I have noted that monome sum creates this problem (when I run it and then run max I have this issue…also if I use the maxforlive monome suite).
I have tried removing monome sum and the issue goeas away but as soon as I load ableton (my template contains monome m4l objects) the issue comes back.