From time to time, I see portlets disappearing and since we hide the "Configure portlets" page in our application, there seems to be no way for the user to get back to the portlets that they have now lost. This happens definitely as a result of the minimize/maxmimize/restore events. Once I change the state of the various portlets and do that over and over again, at some point, I lose one of the portlets and it takes the user to a point of no return.