Hi,
meanwhile I have my siduction-Firestarter with gnome-shell 3.14.0-1 topically.
It works in a VirtualBox 4.3.16 from ORACLE-Homepage
https://www.virtualbox.org/wiki/Downloads (Debian 7 ("Wheezy") i386) under Host aptosid.
I have installed the VBoxGuestAdditions-4.3.16 in the Guest siduction.
But now I can't enter the GNOME-session with this message (vide attachment).
I found out that the reason for this mystic message is because the VBoxGuestAddions-4.3.16 and gnome-shell 3.14.0-1 are incompatible.
After uninstalling the VBoxGuestAdditions from /opt/VBoxGuestAdditions-4.3.16/uninstall.sh the GNOME-session and KDE-session works well again.
I think the passed gnome-shell Version in siduction has a bug because of the mystic message come up.
The KDE-session works fine anyway.
with regards
Ch. Hanisch