Hi Nadia,
without you providing a complete minimal example, and without us
knowing your configuration, we cannot know what the problem is.
Try to make a very simple presentation which still shows the
problem, where the problem goes away if you remove any further
element of it.
Regards,
Jan
--
Prof. Dr. Jan Bredereke
University of Applied Sciences Bremen, Germany.
http://homepages.hs-bremen.de/~jbredereke GnuPG key available.