Vista - Msn live messenger hang

Hi, since some days a strange behaviour occurs with msn (seems to be a bit
"randomly")

A short time after launch (~1 minute) windows live messenger (2009) hang.
Program Windows don't answer and became white, a have to close all or kill
the program.

In connections log i find those lines which repeate itself as long as the
program is not killed:

[16:52:25.63] 09fc PresenceIM.dll: Zone_Messaging
CConversationManagerImpl::FindConversationById@xxxxxx: Found conversation
with matching id.
[16:52:25.63] 09fc PresenceIM.dll: Zone_Messaging
CConversationManagerImpl::FindConversationById@xxxxxx: Found conversation
with matching id.
[16:52:25.63] 09fc PresenceIM.dll: Zone_Messaging
CConversationManagerImpl::FindConversationById@xxxxxx: Found conversation
with matching id.
[16:52:25.63] 09fc PresenceIM.dll: Zone_Messaging
CSDGHandlerImpl::Send@xxxxxx: Roster has non-circle member(1),
SDGTransport cannot handle it

May someone help me to find where it come from?

Thanks you.