monome

I'm having a puzzling problem. I've got two machines with 10.9.4, one that was updated from a previous install and one that is a fresh, untouched 10.9.4 install with only the monome device installer on it.. Serialosc won't connect to my arduinomes on either.

My arduinomes are based on teensy 2.0 ++ boards and are built into a single case, they've been working fine on both machines pre 10.9.4.

The teensy is like the Arduino Uno and shows up as a modem.
I can view both devices from terminal, they show up in /dev
tty.usbmodema40h-201
tty.usbmodema40h-101

If I stop serialosc and the run the old arduinomeserial it will happily connect to the devices and I can use them fine.

I also have a spare arduino duemilanove, if I flash this as an arduinome and plug it into either machine serialosc DOES connect to it and correctly spawns a process for this device.

It's the older FTDI arduino and shows correctly as
tty.usbserial-a40h-001

Anyone got any ideas? I've been googling pretty hard to usbmodem issues on 10.9.4 but can't find anything.
I've had a look at libmonome code and it's correctly expecting a tty.usbmodem pattern which is what I'm seeing.

I'm stumped.