Upon Loïc's instructions, I installed -dbg versions of libc6, glib2.0 and libgstreamer0.10. As soon as I had done that, neither gdb or valgrind could find any error left. Gnome-settings-daemon suddenly worked as expected and so did building gnome-media. I'm completely puzzled as to what happened.
To retrace my steps, I first installed libgst0.10-dbg, which did not help. I then installed valgrind and libc6-dbg, and executed valgrind, which reported that some Altivec instructions were halted. Everything scrolled really fast. At the same time, members of team gnome suggested that installing glib2.0-dbg would make sense, so I did. When I tried running Valgrind again, it could not find any error or report any buffer overflow either. Removing all -dbg libraries did not break anything either. I successfully rebooted and logged back into gnome without error. -- Martin-Éric Racine http://q-funk.iki.fi
