I'm pretty sure I have found the problem.  Can someone who is seeing this issue 
try this as a workaround?

First, don't use the MyFaces StartupServletContextListener.  This listener 
should not be used in a portlet environment.

Second, get your system set to where you see the 
java.lang.NullPointerException: serialFactory.  That is the error that must be 
fixed.

Third, subclass MyFacesGenericPortlet and put these two lines in the init() 
method:

super();
  | getPortletContext().setAttribute("org.apache.myfaces.SERIAL_FACTORY", new 
org.apache.myfaces.shared_impl.util.serial.DefaultSerialFactory
  | ()); 

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