Huge problems connecting KEYTAR ROLAND AX7

Hi I have a *huge problem playing with my Roland AX7 in Mainstage 2* (it was all ok with Mainstage 1).

This keyboard has a lot of problems transmitting midi notes to Mainstage. It doesn't always transmit note on or note off midi messages, so I can play a note and it remains held down even if I'm not pressing it anymore. Very often Mainstage doesn't recognize note on messages.
All controller midi messages are correctly supported (sustain, Mwheel, pitch). Anyway this situation doesn't let me perform with the software.
I tried to connect with another keyboard (a Kurzweil K2600X) and it all works correctly.

I use the CME Widi-x8 to connect to the macbook via usb.
Anyway I had no problems playing with the old version of Mainstage.

HELP!