[Vince]

An IP doesn't just randomly change. There is such thing as a lease time. As long as the lease time hasn't expired the IP won't change. When the lease is about to expire, the client attempts to extend the lease time and most of the time this is succesful.

Some ISPs also block loopbacks on the external IP. Your server shows up fine for me. Don't know why you're still on 0.3c, though.