Hmmm didn't provide much information and my crystal ball stopped working.

But as a thought check your firewall settings.

If that doesn't help check out this link and post back. http://www.gnutellaforums.com/announ...php?forumid=23

Also switching between leaf and Ultrapeer is an automatic function of LimeWire. It determines if you have the capability to be one and if the Gnutella network needs you as one.