Firas - This is a known bug, but I don't think it ever made it into
the bug tracker. See the threads from < http://lists.gnu.org/archive/html/discuss-gnuradio/2007-10/msg00159.html >. If you have time (I don't for a few weeks), could you please
enter it in as a new bug ticket? Try out the script from the link,
and see if it doesn't work for you. If this script shows what you've
found, please also enter it in the ticket. - MLD