excute from terminal, informations is below
$ meld
/usr/lib/meld/undo.py:186: DeprecationWarning: Class UndoSequence is already GObject-
registered; Please note that classes containing any of the attributes __gtype_name__, 
__gproperties__, or __gsignals__ are now automatically registered.
  gobject.type_register(UndoSequence)
/usr/lib/meld/melddoc.py:126: DeprecationWarning: Class MeldDoc is already GObject-registered; 
Please note that classes containing any of the attributes __gtype_name__, __gproperties__, or 
__gsignals__ are now automatically registered.
  gobject.type_register(MeldDoc)
/usr/lib/meld/dirdiff.py:164: DeprecationWarning: Class EmblemCellRenderer is already GObject-
registered; Please note that classes containing any of the attributes __gtype_name__, 
__gproperties__, or __gsignals__ are now automatically registered.
  gobject.type_register(EmblemCellRenderer)
#*****************************here open to select files
*** glibc detected *** free(): invalid pointer: 0xb7868580 ***
#*****************************kill
killed

and i check all package, within two ubuntu version.
//*****************************
ubuntu hoary. works well !!!!!!!!!!!!!!!! 
//*****************************
exp@exp-off:~$ dpkg -s meld
Package: meld
Status: install ok installed
Priority: optional
Section: gnome
Installed-Size: 1100
Maintainer: Ross Burton <ross@debian.org>
Architecture: all
Version: 0.9.4.1-1ubuntu1
Depends: python (<< 2.5), python (>= 2.4), python-gtk2 (>= 1.99.14-1), python-glade2, python-
gnome2
Description: Graphical tool to diff and merge files
 Meld is a tool which allows the user to see the changes in, and merge
 between, either two files or two files with a common ancestor.
//=====================
exp@exp-off:~$ dpkg -s python|grep Version
Version: 2.4.1-0ubuntu2
exp@exp-off:~$ dpkg -s python-gtk2|grep Version
Version: 2.6.1-0ubuntu2
exp@exp-off:~$ dpkg -s python-glade2|grep Version
Version: 2.6.1-0ubuntu2
exp@exp-off:~$ dpkg -s python-gnome2|grep Version
Version: 2.10.0-0ubuntu1
 
//*****************************
ubuntu breezy. dead after select any file or dirctory !!!!!!!!!!!!!!!!!!!!
//*****************************
exp@exp-off:~$ dpkg -s meld
Package: meld
Status: install ok installed
Priority: optional
Section: gnome
Installed-Size: 1536
Maintainer: Ross Burton <ross@debian.org>
Architecture: all
Version: 1.0.0-1
Depends: python (<< 2.5), python (>= 2.4), python-gtk2 (>= 2.4), python-glade2 (>= 2.4), 
python-gnome2
Recommends: python-gnome2-extras
Description: graphical tool to diff and merge files
 Meld is a tool which allows the user to see the changes in, and merge between,
 either two files, two directories, or two files with a common ancestor.
//=====================
exp@exp-off:~$ dpkg -s python|grep Version
Version: 2.4.2-0ubuntu2
exp@exp-off:~$ dpkg -s python-gtk2|grep Version
Version: 2.8.1-0ubuntu2
exp@exp-off:~$ dpkg -s python-glade2|grep Version
Version: 2.8.1-0ubuntu2
exp@exp-off:~$ dpkg -s python-gnome2|grep Version
Version: 2.12.1-0ubuntu1
exp@exp-off:~$ dpkg -s python-gnome2-extras|grep Version
Version: 2.12.0-0ubuntu1
//*****************************