Well, the obvious Q would be... You are using a Mac, are you not? Make sure the plugin directory is, in fact, the one where Photoshop is installed.Sometimes plugin installers makle their own directories. Some filters require more than one file in the "Plugin" directory to work. Some also need system files to be installed at other locations. Not sure about Genuine Fractals, how is the plugin shipped/packaged? Do you have instructions? Sometime filters have to go in the "Filter" directory itself.