From owner-freebsd-ports@FreeBSD.ORG  Wed May 19 14:46:45 2010
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Date: Wed, 19 May 2010 08:46:44 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Sandra Kachelmann <s.kachelmann@googlemail.com>
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Cc: ports@freebsd.org, x11@freebsd.org, oliver@freebsd.org
Subject: Re: xfce4/xorg problem amd64
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On Wed, 19 May 2010, Sandra Kachelmann wrote:

> Since the xorg update my xfce4 desktop has become unusable. I always
> get the error message below. I even setup FreeBSD 8.0-RELEASE from
> scratch, updated to 8.0-STABLE, installed xorg and xfce4 with default
> settings:
...
> So now everything should be completely vanilla:
...
> xfdesktop[7480]: starting up
> process 7466: arguments to dbus_message_new_signal() were incorrect,
> assertion "_dbus_check_is_valid_path (path)" failed in file
> dbus-message.c line 1165.
> This is normally a bug in some application using the D-Bus library.
>  D-Bus not compiled with backtrace support so unable to print a backtrace
> Abort trap (core dumped)

If you can live without the features of xfce4-session, deinstalling it 
should allow xfce to run.

There's another approach that may work for you here:
   http://lists.freebsd.org/pipermail/freebsd-ports/2010-May/061097.html

-Warren Block * Rapid City, South Dakota USA