Version:            (using KDE KDE 3.5.4)
Installed from:    Debian testing/unstable Packages
Compiler:          gcc (GCC) 4.1.2 20060729 (prerelease) (Debian 4.1.1-10) 
OS:                Linux

Attempting to connect to UltraVNC Server Rel 1.0.2 running on Windows XP and I get a segfault. Backtrace attached.

Using host libthread_db library "/lib/tls/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1497475392 (LWP 10906)]
[New Thread -1500849232 (LWP 10911)]
[KCrash handler]
#5  0x0805aefd in vidmodeFullscreenSwitch (dpy=0x80ad1b8, screen=1, sw=1920, 
    sh=1200, nx=@0xafa5593c, ny=@0xafa55938)
    at /home/sid-user/kdenetwork/kdenetwork-3.5.4/./krdc/vidmode.cpp:73
#6  0x0806a055 in KRDC::switchToFullscreen (this=0x814f318, scaling=false)
    at /home/sid-user/kdenetwork/kdenetwork-3.5.4/./krdc/krdc.cpp:415
#7  0x0806a494 in KRDC::qt_invoke (this=0x814f318, _id=49, _o=0xafa55a20)
    at ./krdc.moc:165
#8  0xa7772b87 in QObject::activate_signal (this=0x8173650, clist=0x816f4b8, 
    o=0xafa55a20) at kernel/qobject.cpp:2356
#9  0x0805c1a3 in KRemoteView::changeSize (this=0x8173650, t0=1920, t1=1200)
    at ./kremoteview.moc:142
#10 0x08076286 in KVncView::customEvent (this=0x8173650, e=0x816f280)
    at /home/sid-user/kdenetwork/kdenetwork-3.5.4/./krdc/vnc/kvncview.cpp:379
#11 0xa777228f in QObject::event (this=0x8173650, e=0x816f280)
    at kernel/qobject.cpp:755
#12 0xa77a944a in QWidget::event (this=0x8173650, e=0x816f280)
    at kernel/qwidget.cpp:4678
#13 0xa770aaea in QApplication::internalNotify (this=0xafa561ac, 
    receiver=0x8173650, e=0x816f280) at kernel/qapplication.cpp:2635
#14 0xa770d49a in QApplication::notify (this=0xafa561ac, receiver=0x8173650, 
    e=0x816f280) at kernel/qapplication.cpp:2523
#15 0xa7e8b52e in KApplication::notify (this=0xafa561ac, receiver=0x8173650, 
    event=0x816f280)
    at /home/sid-user/kdelibs/kdelibs-3.5.4/./kdecore/kapplication.cpp:550
#16 0xa769e3d1 in QApplication::sendEvent (receiver=0x8173650, 
    event=0x816f280) at ../include/qapplication.h:520
#17 0xa770bb12 in QApplication::sendPostedEvents (receiver=0x0, event_type=0)
    at kernel/qapplication.cpp:3299
#18 0xa770bc1a in QApplication::sendPostedEvents ()
    at kernel/qapplication.cpp:3210
#19 0xa76b1c05 in QEventLoop::processEvents (this=0x80f1ba0, flags=4)
    at kernel/qeventloop_x11.cpp:144
#20 0xa772503d in QEventLoop::enterLoop (this=0x80f1ba0)
    at kernel/qeventloop.cpp:198
#21 0xa7724e5e in QEventLoop::exec (this=0x80f1ba0)
    at kernel/qeventloop.cpp:145
#22 0xa770c683 in QApplication::exec (this=0xafa561ac)
    at kernel/qapplication.cpp:2758
#23 0x08068068 in main (argc=135640224, argv=0x80ac610)
    at /home/sid-user/kdenetwork/kdenetwork-3.5.4/./krdc/main.cpp:156
#24 0xa6c8fea8 in __libc_start_main () from /lib/tls/libc.so.6
#25 0x080582e1 in _start () at ../sysdeps/i386/elf/start.S:119