Hi again
Well, surprised it was working fine with the companion because I would usually ask people to use an APK (Companion just gets in the way!).
I have tweaked your code, see attached: BluetoothWatch_1.aia Note, Chrome flags .aia files as dangerous - you have to "accept anyway" to receive it :(
The string sent to Arduino should not end " \n" (space newline) because the Bluetooth function is going to append it with an end-of-data mark ( = \n). I have added this to your screen initialization.
I have also added an extra Label to QA the send - that allows you to see that the string you are sending is as expected.
If the tweaked Project does not work and you still can't see why, please post your Arduino Sketch here.