Could you get a valgrind log as described on https://wiki.ubuntu.com/Valgrind with libglib2.0-0-dbg libgtk2.0-0-dbg gedit-dbgsym (https://wiki.ubuntu.com/DebuggingProgramCrash describe how to install the dbgsym package) installed? -- gedit cannot open any text file https://launchpad.net/bugs/69541