Allin: Reinstalling X11 solved the problem. I really don´t understand what happened. Anyway, it is safe to reinstal X11. All the other application running on X11 are working fine, so it seems it is not necessary to uninstall it first. Thanks for all your help! * Fernando Díaz H., Ph.D.* Assistant Professor of Finance School of Economics and Managerial Sciences Universidad de los Andes (56 2) 412-9650 ferdiaz(a)uandes.cl fdiaz(a)stima.cl Avda. San Carlos de Apoquindo 2200, Las Condes, Santiago Chile On Wed, Sep 24, 2008 at 5:37 PM, Allin Cottrell <cottrell(a)wfu.edu&gt; wrote: