dolphin and konqueror fail to open directories (KDE4.3 backport)

[Guest]

I have the same problem with slow "move to trash" as discribed here: http://kubuntuforums.net/forums/inde...opic=3105982.0
Today, moving a bz2-file to trash went to slow for my taste and I cancelled the operation. Since then, I am not able any more, to use dolphin. Also Konqueror refuses to open files or folders (acting as a file-manager). Started from terminal, in both cases the same error message is shown:

~$ dolphin
<unknown program name>(4020)/: Communication problem with "dolphin" , it probably crashed. 
Error message was: "org.freedesktop.DBus.Error.NoReply" : " "Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken." "

~$ konqueror ./
"/usr/bin/konqueror(4032)" Error in thread 3052485456 : "org.freedesktop.DBus.Error.NoReply - Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken."

After about two minutes dolphin starts at home directory. But dolphin is still very slow (clicking on "Desktop" and two more minutes waiting before being able to perform the next action)

I already removed the .dbus folder in my home dir. and restarted dbus, but nothing got better.

Anyone who knows the problem?

thanks

matthias