Under your connection tab (you may need to enable it by going to the 'View' menu item and ticking the connection box) type router4.limewire.com and manually remove any non-ultrapeer connections.

If you are able to make some connection - then there is no good reason why you shouldn't be able to find an ultrapeer. (A Gnucleus connection is also an ultrapeer connection although some people prefer the LimeWire Ultrapeers).

You may have wandered into an backwater of the gnutella network that doesn't have many ultrapeers lying around. router4.limewire.com should bring you back to the center of activity (as it were).

Mark