OSC problems on Mac OS build

I’m trying to read some OSC messages in Unity. Everything works fine when testing inside Unity, but when building the OSX app nothing works. I’ve tried using different OSC plugins, so I suspect it is a problem with the UDP server of Mono.

Has anyone had success with setting up OSC in Mac OS?

I’m on 10.8 with Unity 4.3

I’m not sure why, but the problem was that I was building for x64. When changing that the problem disappears.