OSC receiver stopped working.

HI everyone, hoping someone can help.

running Yosemite, the native osc receive patch just suddenly stopped working. One minute it was doing its thing, next thing i know it's stopped. simply isn't publishing its port - nothing can see it, ive tried with osculator, touch osc etc.

Removed all my plugins in case there was some kind of conflict, - including the qcOSC plugin, reinstalled Quartz composer, the works. Still just sits there and does nothing. (yes viewer window is open.

No clues from console, either.

Anyone got any ideas?

Thanks