Gnome-WARNING **: invalid gnome config path '=/section/key'

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Thanks!

That is what iam getting after Upgrade from Ubuntustudio 8.04 to 8.10

How come you converted your own bug report in to a question? Could you please specify exactly what steps you take to experience that warning? It is difficult to help you without understanding under what context you experience the warning

I experience right the same.
This is how the complete message looks like:
"Gnome-WARNING **: invalid gnome config path '=/section/key'
GLib-GObject-WARNING **: /build/buildd/glib2.0-2.18.2/gobject/gsignal.c:1152: unable to lookup signal "show" of unloaded type `GtkMessageDialog' at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 54, <> line 1.
GLib-GObject-CRITICAL **: g_signal_add_emission_hook: assertion `signal_id > 0' failed at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 54, <> line 1.
Gnome-WARNING **: invalid gnome config path '=/section/key'
GLib-GObject-WARNING **: /build/buildd/glib2.0-2.18.2/gobject/gsignal.c:1152: unable to lookup signal "show" of unloaded type `GtkMessageDialog' at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 60, <> line 1.
GLib-GObject-CRITICAL **: g_signal_add_emission_hook: assertion `signal_id > 0' failed at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 60, <> line 1."

The message appeared first right when upgrading to Ubuntu studio 8.04->8.10 via "softwaresources->Enable normal releases" and "upgrade manager"; on 8.10 package install stage within upgrader.

This message persisted several dozen times as different packages were installed.
Nevertheless upgrade was performed successfully.

Now I get this message when I try to install ANY new packages within synaptic or apt-get install. For example gnome-commander.

Upgrade also messed up user rights, so I cannot su root at all and Im also unable to call Gnome-System-Monitor(via monitor panel gadgets)-> I get instant unrecoverable system freeze(switching to tty doesnt work). Hopefully this can be related.