Hello, There is a critical bug in libjson-glib-1.0-0 package in Squeeze: doubles serialization does not works. As a result, some applications can't operate properly (e.g. can't save their config files). It is a known problem and it was fixed in the upstream source repo almost 2 year ago. The patch is available [1].
[1] http://git.gnome.org/browse/json-glib/patch/?id=f622ee8d8ba54ddea6fbb7311a905ffab7842e8d Best regards, Anton