Same for me (LimeWire for OS X). The serach button remains dimmed. When I use the connect command, the search button is activated for a fraction of a second and then greyed out again. Does my new ADSL moden/router with built in FireWall something have to do with it? Even when I enter one of the 'default' ports from the router's manual in LimeWire, this does not help. It used to be such a nice app....