> Enabled proposed. After upgrade I was able to login in both sessions -Please disable -proposed. If something is not in -release, it will
> flashback with metacity and flashback with compiz.
most probably break your system.
I'm fine with that. Will change again in the next upload (3.8.1?).
> Only session names seems too long for lightdm. Maybe session names can be
> GNOME Flashback (Metacity) and GNOME Flashback (Compiz)?