Rsync completely hangs machine

[Jonathan Melhuish <lists@netacclaim.co.uk>]

I have a headless network server at home on which I am running Debian 
stable and the latest "stable" release of rsync.  It was previously 
working fine, but now hangs the machine (or at least, it disappears from 
the network) as soon as my rsync client attempts to send the first file.

Anybody got any ideas how to fix this?

Cheers,

Jon