You cannot re-create an existing portlet

[CR #315093] If you create a portlet with a URL that changes or becomes invalid, you may see this message when you attempt to display the portlet:

"The portlet you have requested is currently not responding. Select refresh first, if that doesn't work then click the 'Recreate Portlet' button." 

Workaround: Delete the portlet, then create a new one using the Create Portlet link.