I had this problem for saving prefs. on OSX till I discovered that closing windows with the upper left button solve my problem. When I was Quitting Limewire at the menu level it didn't saved prefs. Now I don't have problem because I deleted the version I had (all folder and invisible one in pref) and till that all installer of various version of LimeWire stall at tree quarter of the starting process. Till someone help me I will used other programms like Drumbeat, x-nap or Neo.