I reply to your post above:
First point: now the lights never light up, even when I connect the USB cable.
Second point: True, a few days ago it worked on iMac of my friend and Even yesterday morning it worked once on my macbook pro with the new installation of OSX Sierra.
Other:
The version of serialiosc I installed is 1.4. Is this the right version for Sierra OSX?
I have found AppleUSBFTDI driver in System/Library/Extensions Folder, is it right?
Or this driver should be in HD/Library/Extensions Folder Like old version FTDI?
When I connect the USB plug between the grid monome and macbook pro, in Max7 screen GridHowTo I read “m40h0205”. If I disconnect the cable and after one moment I reconnect it to computer, Max7 recognize monome perfectly, but still does not allow me to check, to check the correct operation and I do not see light at the pressure on the pads also if in this moment I am Reading on screen “m40h0205” CONNECTED.