Thank you for reporting. It is a known bug of v5.0.2 see here for a fix: <http://qe-forge.org/pipermail/pw_forum/2013-January/100812.html>
bests -- Dr. Lorenzo Paulatto IdR @ IMPMC -- CNRS & Universit? Paris 6 phone: +33 (0)1 44275 084 / skype: paulatz www: http://www-int.impmc.upmc.fr/~paulatto/ mail: 23-24/4?16 Bo?te courrier 115, 4 place Jussieu 75252 Paris C?dex 05
