Could you do the following:

1) kill gtkg
2) download http://www.guruz.de/gnutella/gnutell...ard_port.hosts
3) copy that file to ~/ultras and to ~/hosts
4) start gtkg

(do this with 0.92x)

Does that work?
Do you get any interesting messages when starting gtkg about gwebcache ?
what do you mean by "stops downloading host list" ?