plasma-desktop fail to start

[Dj YB]

Hello,
FC 13 kde 4.5.2

the problem is only in my user.
I can't start plasma-desktop

how can I fix (investigate) this any further?

Thanks in advance,
YB.

the output of executing plasma-desktop is as follows:

$ plasma-desktop
QDBusObjectPath: invalid path ""
QFont::setPointSize: Point size <= 0 (0), must be greater than 0
QFont::setPointSize: Point size <= 0 (0), must be greater than 0
Invalid D-BUS interface name 'org.kde.plasma-desktop.PlasmaApp' found while 
parsing introspection
KCrash: Attempting to start /usr/bin/plasma-desktop from kdeinit
sock_file=/home/djyb/.kde/socket-localhost.localdomain/kdeinit4__0
<unknown program name>(11500)/: Communication problem with  "plasma-desktop" , 
it probably crashed. 
Error message was:  "org.freedesktop.DBus.Error.NoReply" : " "Message did not 
receive a reply (timeout by message bus)" " 

KCrash: Application 'plasma-desktop' crashing...
KCrash: Attempting to start /usr/libexec/kde4/drkonqi from kdeinit
sock_file=/home/djyb/.kde/socket-localhost.localdomain/kdeinit4__0