Kopete with Yahoo gets messages but can't respond back to MSN

I use Kopete in Kubuntu 9.04 Alpha 5 with Yahoo! account. I do get messages from my friends that have MSN hotmail, but when i type a message to them, they don't get my answer. This is not an issue for other IM clients like Pidgin.
-----------------------------------------------------------------

#lsb_release -a
LSB Version: core-2.0-ia32:core-2.0-noarch:core-3.0-ia32:core-3.0-noarch:core-3.1-ia32:core-3.1-noarch:core-3.2-ia32:core-3.2-noarch:cxx-3.0-ia32:cxx-3.0-noarch:cxx-3.1-ia32:cxx-3.1-noarch:cxx-3.2-ia32:cxx-3.2-noarch:desktop-3.1-ia32:desktop-3.1-noarch:desktop-3.2-ia32:desktop-3.2-noarch:graphics-2.0-ia32:graphics-2.0-noarch:graphics-3.0-ia32:graphics-3.0-noarch:graphics-3.1-ia32:graphics-3.1-noarch:graphics-3.2-ia32:graphics-3.2-noarch:qt4-3.1-ia32:qt4-3.1-noarch
Distributor ID: Ubuntu
Description: Ubuntu jaunty (development branch)
Release: 9.04
Codename: jaunty
----------------------------------------------------------------
#kopete -v
Qt: 4.5.0
KDE: 4.2.1 (KDE 4.2.1)
Kopete: 0.70.0
----------------------------------------------------------------