I have the same problem too in Wheezy (Debian 7).
It is ok when run "gstreamer-properties" at first time
and I got this error after second time.
$ gstreamer-properties
(gstreamer-properties:4804): Gtk-WARNING **: Unknown property: GtkDialog
.has-separator
(gstreamer-properties:4804): Gtk-WARNING
Because bug#599626
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/599626
I remove monitors.xml
rm ~/.config/monitors.xml
Then I get an error notification every startup before login.
"Could not apply the stored configuration for monitors
Error on line 1 char 1: Document was empty or co
I try to setup monitor again.
Even ~/.config/monitors.xml comes back, the error message still there everytime
before I login.
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