Hi Marcio, I got rid of the same problem (MyFacesContextFactoryImpl ClassNotFoundException) by replacing the MyFacesContextFactoryImpl in the faces-config.xml by FacesContextFactoryImpl.
Dan Grimstad -- View this message in context: http://www.nabble.com/MyFaces-Portlet-does-not-work.-please-help-t1443600.html#a4031070 Sent from the MyFaces - Users forum at Nabble.com.

