Version:            (using Devel)
Compiler:          gcc x86_64-pc-linux-gnu 4.2.4 (Gentoo 4.2.4-r1 p1.1)  
OS:                Linux
Installed from:    Compiled sources

the latest version in svn of the networkmanagement plasmoid doesn't start and terminates with an D-Bus error message.

process 31415: arguments to dbus_message_new_method_call() were incorrect, assertion "_dbus_check_is_valid_path (path)" failed in file dbus-message.c line 1074.
This is normally a bug in some application using the D-Bus library.
  D-Bus not built with -rdynamic so unable to print a backtrace
KCrash: Application 'plasmoidviewer' crashing...
sock_file=/home/stephan/.kde/socket-gentoolap/kdeinit4__0
KCrash cannot reach kdeinit, launching directly.
KCrash failed to exec(), errno = 2

i could track it down, that the networkmanagement plasmoid tries to open/create a dbus connection to the interface org.kde.networkmanagement. But D-Bus doesn't find a corresponding .service file.

backtrace when try to run the plasmoid with the plasmoidviewer
#0  0x00007f046334b5c5 in raise () from /lib/libc.so.6
#1  0x00007f046334ca70 in abort () from /lib/libc.so.6
#2  0x00007f045cfb2575 in _dbus_abort () from /usr/lib/libdbus-1.so.3
#3  0x00007f045cfae835 in _dbus_warn_check_failed () from /usr/lib/libdbus-1.so.3
#4  0x00007f045cfa3d77 in dbus_message_new_method_call () from /usr/lib/libdbus-1.so.3
#5  0x00007f0464efa1f9 in ?? () from /usr/lib64/qt4/libQtDBus.so.4
#6  0x00007f0464ef604c in ?? () from /usr/lib64/qt4/libQtDBus.so.4
#7  0x00007f0464ef6e52 in ?? () from /usr/lib64/qt4/libQtDBus.so.4
#8  0x00007f0464effeab in ?? () from /usr/lib64/qt4/libQtDBus.so.4
#9  0x00007f0464efffb6 in QDBusInterface::QDBusInterface () from /usr/lib64/qt4/libQtDBus.so.4
#10 0x00007f044b98d26c in RemoteActivatableList::init (this=0xe6ab00)
    at /home/stephan/tmp/networkmanager/libs/client/remoteactivatablelist.cpp:69
#11 0x00007f044bbb25fd in NetworkManagerApplet::init (this=0xdd5940)
    at /home/stephan/tmp/networkmanager/applet/networkmanager.cpp:148
#12 0x00007f04658f6e90 in Plasma::Containment::addApplet () from /usr/kde/svn/lib64/libplasma.so.3
#13 0x00007f04658f9bef in Plasma::ContainmentPrivate::addApplet () from /usr/kde/svn/lib64/libplasma.so.3
#14 0x0000000000406698 in FullView::addApplet ()
#15 0x0000000000408f33 in main ()