Pear net_server package

Hi there,

I've been attempting to use the pear net_server package php to put together a basic multi-socket server.
When using the chat server example that's included as part of the package, everything works fine as long as only one client is connected.
If I try to connect more than one, the server locks up. Anyone any ideas as to what I might be doing incorrectly ?

Relevant info :

O/S Ubuntu 11.04
Php 5
Client connections are telnets via local terminal instances.