Unfortunately a dependency issue slipped in. It is fixed in version 0.2-6 which is in testing currently.
Qlister requires pyqt4.7.3 but pyqt libraries are not automatically updated eventhough 4.7.3 are in extras.
As a workaround you can manually update the pyqt components from xterm with these commands (you need rootsh installed):
root apt-get install python2.5-qt4-core python2.5-qt4-gui
After that the application should work as normal.