Hi Colin, > Yes, I wrote this pub/sub gist to demonstrate: https://gist.github.com/918471 > > Again, this is with 0MQ 2.1.3, JRuby 1.6.0, FFI ruby bindings ffi-rzmq > (0.7.2) on OSX. I've created a ticket for the problem: https://github.com/zeromq/libzmq/issues/191 Martin