Can't send messages to Empathy using Bonjour

[amay82]

Binary package hint: pidgin

Steps to reproduce:
1) On one computer, start Empathy, "persons in neighbourhood" (Bonjour) is active by default
2) On another computer in the LAN, start pidgin with Bonjour activated
3) Send a message from Pidgin to Empathy

Result:
4a) Pidgin says "Can't send message, can't initiate conversation"

Expected results:
4b) Pidgin should send the message.

Additional info:
A1) Sending from Empathy to Pidgin works
A2) When Empathy initiates the conversation to Pidgin, sending messages back works too

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: pidgin 1:2.7.3-1ubuntu3.1
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
Architecture: amd64
Date: Tue Nov 23 21:11:05 2010
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/pidgin
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release Candidate amd64 (20100928)
ProcEnviron:
 SHELL=/bin/bash
 LANG=de_AT.UTF-8
SourcePackage: pidgin