Arduino 101 issue

Hello,

I am writing because I am facing a strange issue.

I am using the new 101 Arduino card and the card is streaming data via Serial.

I can properly read the data with Putty and with the serial monitor.

In Firefly everything is working fine and the port is properly open, but I have no data stream.

It goes from <null> to <enpty>.

If I use the Software Serial and a TTL converter everything works;

If I change card (Arduino Uno) everything is fine;

If I use another 101 (I tested some of them) it is not working.

The problem is between the 101 and Firefly (it's perfect on Putty).

I also changed laptop to avoid usb 2/3 issues.

It looks like the baud speed could be a problem. If I change speed on Putty or Serial Monitor nothing changes, it look like the speed is kind of 'universal'.

Do you have any hint?

All the best,

Fabio