I have the same problem.

Console output:
QGDict::hashKeyString: Invalid null key
QGDict::hashKeyString: Invalid null key
kopete: ERROR: : couldn't create slave : Unable to create io-slave:
klauncher said: Unknown protocol ''.
kopete:
KCrash: Application 'kopete' crashing...

KDE Crash Handler with dbg:
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1241896464 (LWP 30109)]
[KCrash handler]
#6  MSNAccount::slotNotifySocketClosed (this=0x82d57a8)
    at /build/buildd/kdenetwork-3.5.8/./kopete/protocols/msn/msnnotifysocket.h:72
#7  0xb5901668 in MSNAccount::qt_invoke (this=0x82d57a8, _id=33, 
    _o=0xbfbbc65c) at ./msnaccount.moc:227
#8  0xb6842893 in QObject::activate_signal (this=0x8467ba8, clist=0x84684d8, 
    o=0xbfbbc65c) at kernel/qobject.cpp:2356
#9  0xb6843338 in QObject::activate_signal (this=0x8467ba8, signal=5)
    at kernel/qobject.cpp:2325
#10 0xb590a8dc in MSNSocket::socketClosed (this=0x8467ba8)
    at ./msnsocket.moc:204
#11 0xb591e4cd in MSNNotifySocket::disconnect (this=0x8467ba8)
    at /build/buildd/kdenetwork-3.5.8/./kopete/protocols/msn/msnnotifysocket.cpp:101
#12 0xb591af3b in MSNNotifySocket::sslLoginFailed (this=0x8467ba8)
    at /build/buildd/kdenetwork-3.5.8/./kopete/protocols/msn/msnnotifysocket.cpp:673
#13 0xb59210f5 in MSNNotifySocket::qt_invoke (this=0x8467ba8, _id=22, 
    _o=0xbfbbc7ac) at ./msnnotifysocket.moc:387
#14 0xb6842893 in QObject::activate_signal (this=0x8472bb0, clist=0x8465e90, 
    o=0xbfbbc7ac) at kernel/qobject.cpp:2356
#15 0xb6843338 in QObject::activate_signal (this=0x8472bb0, signal=4)
    at kernel/qobject.cpp:2325
#16 0xb593b16c in MSNSecureLoginHandler::loginFailed (this=0x8472bb0)
    at ./msnsecureloginhandler.moc:113
#17 0xb593b40f in MSNSecureLoginHandler::slotTweenerReceived (this=0x8472bb0, 
    authJob=0x847ee38)
    at /build/buildd/kdenetwork-3.5.8/./kopete/protocols/msn/msnsecureloginhandler.cpp:128
#18 0xb593c5a6 in MSNSecureLoginHandler::qt_invoke (this=0x8472bb0, _id=3, 
    _o=0xbfbbc8d4) at ./msnsecureloginhandler.moc:120
#19 0xb6842893 in QObject::activate_signal (this=0x847ee38, clist=0x8472cd8, 
    o=0xbfbbc8d4) at kernel/qobject.cpp:2356
#20 0xb747d021 in KIO::Job::result (this=0x847ee38, t0=0x847ee38)
    at ./jobclasses.moc:162
#21 0xb74d58cd in KIO::Job::emitResult (this=0x847ee38)
    at /build/buildd/kdelibs-3.5.8/./kio/kio/job.cpp:235
#22 0xb74d5d2e in KIO::SimpleJob::slotFinished (this=0x847ee38)
    at /build/buildd/kdelibs-3.5.8/./kio/kio/job.cpp:601
#23 0xb74d643d in KIO::TransferJob::slotFinished (this=0x847ee38)
    at /build/buildd/kdelibs-3.5.8/./kio/kio/job.cpp:971
#24 0xb74d5301 in KIO::SimpleJob::qt_invoke (this=0x847ee38, _id=7, 
    _o=0xbfbbcc38) at ./jobclasses.moc:417
#25 0xb74d5363 in KIO::TransferJob::qt_invoke (this=0x847ee38, _id=7, 
    _o=0xbfbbcc38) at ./jobclasses.moc:1082
#26 0xb6842893 in QObject::activate_signal (this=0x82033c8, clist=0x84426f8, 
    o=0xbfbbcc38) at kernel/qobject.cpp:2356
#27 0xb6bce8ec in QSignal::signal (this=0x82033c8, t0=@0x82033f0)
    at .moc/debug-shared-mt/moc_qsignal.cpp:100
#28 0xb6862842 in QSignal::activate (this=0x82033c8) at kernel/qsignal.cpp:212
#29 0xb686a258 in QSingleShotTimer::event (this=0x82033a0)
    at kernel/qtimer.cpp:286
#30 0xb67d9af0 in QApplication::internalNotify (this=0xbfbbd264, 
    receiver=0x82033a0, e=0xbfbbcf88) at kernel/qapplication.cpp:2635
#31 0xb67db91f in QApplication::notify (this=0xbfbbd264, receiver=0x82033a0, 
    e=0xbfbbcf88) at kernel/qapplication.cpp:2358
#32 0xb6f9fca2 in KApplication::notify (this=0xbfbbd264, receiver=0x82033a0, 
    event=0xbfbbcf88)
    at /build/buildd/kdelibs-3.5.8/./kdecore/kapplication.cpp:550
#33 0xb676c209 in QApplication::sendEvent (receiver=0x82033a0, 
    event=0xbfbbcf88) at ../include/qapplication.h:520
#34 0xb67cc53b in QEventLoop::activateTimers (this=0x815e220)
    at kernel/qeventloop_unix.cpp:556
#35 0xb6780d49 in QEventLoop::processEvents (this=0x815e220, flags=4)
    at kernel/qeventloop_x11.cpp:389
#36 0xb67f41ce in QEventLoop::enterLoop (this=0x815e220)
    at kernel/qeventloop.cpp:198
#37 0xb67f3fde in QEventLoop::exec (this=0x815e220)
    at kernel/qeventloop.cpp:145
#38 0xb67db699 in QApplication::exec (this=0xbfbbd264)
    at kernel/qapplication.cpp:2758
#39 0x0807f95c in main (argc=8372248, argv=0xb6d93a80)
    at /build/buildd/kdenetwork-3.5.8/./kopete/kopete/main.cpp:107
#40 0xb5fe9050 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#41 0x0806f071 in _start ()