There changed something in glib. See https://bugzilla.gnome.org/show_bug.cgi?id=687659 and https://mail.gnome.org/archives/gtk-devel-list/2012-November/msg00007.html
Wheezy should not be affected by this but dia needs to be fixed for newer glib versions. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org