Missing /tmp/dbus-XXX

Hi,

I am running F19+XFCE:
uname -a
Linux morgawr 3.10.3-300.fc19.x86_64 #1 SMP Fri Jul 26 00:00:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

When I start emacs at the command line I get:
** (emacs:9897): WARNING **: Couldn't register with accessibility bus: 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.

This is not a big problem but the delay of 3-4 seconds while it (maybe) looks for d-bus is irritating so I thought I'd try and fix it.

The dbus socket appears in the netstat output (edited):
netstat -a
.
.
.
unix 3 [ ] STREAM CONNECTED 39905 @/tmp/dbus-nHoJDQk4vP
unix 3 [ ] STREAM CONNECTED 38035 @/tmp/.X11-unix/X0
unix 3 [ ] STREAM CONNECTED 21618 /var/run/dbus/system_bus_socket
.
.

I assume that, as for "ls" @ means "symbolic link".

My mystery is that the dbus socket does not appear in /tmp:

ls -aFH /tmp
./ ssh-1aQKVbzxWHQW/
../ systemd-private-nM6ZFz/
claws-mail-1000/ systemd-private-sf69Zz/
.com.google.Chrome.62EWZt/ .Test-unix/
CRX_75DAF8CB7768/ .X0-lock
.esd-1000/ .X11-unix/
.font-unix/ .xfsm-ICE-2N9Q0W
.ICE-unix/ .XIM-unix/
libpeerconnection.log yum_save_tx.2013-08-01.11-18.i71hVg.yumtx

The DBUS_SESSION_BUS_ADDRESS variable is set:

echo $DBUS_SESSION_BUS_ADDRESS
unix:abstract=/tmp/dbus-nHoJDQk4vP,guid=XXXXX

.xsession-errors has no messages to do with dbus

Checking the files in /var/log, only wpa_supplicant.log has anything related to dbus: many lines like
dbus: wpas_dbus_bss_signal_prop_changed: Unknown Property value 7

Any hints about what is going on here?

Thanks in advance.