I am trying to add a ethernet switch under preferences and whichever image I try to select i get an error message stating it is not a valid IOU image. It appears that I do not have an IOU image. The issue is that when I try to exit out of preferences I have no other option than to kill the application.

Neither the back button nor the exit button on the window seems to work.

I am using OSX mavericks and beta 4 of gns3.