I recently tried to get the NetStorage portlet to run on two separate
UserApp instances. When I configure the portlet and select it, I a message
similar to "unable to display...".

I have followed the directions in the portlet doc exactly, except that I
had to unzip the IDM.war file, then the portlet-accessories.jar file, to
get the gadget.html file. I then placed it under tomcat/webapps/NetVision/

Has anyone got this to work?