My problem is simple: I downloaded 4.12.3, and although the old limewire was working great with avast, the installation gets as far as starting to open the program and then says "Limewire was unable to initialize and start. This is usually due to a firewall program blocking Limewire's access to the internet or loopback connections on the local machine. Please allow Limewire access to the internet and restart Limewire."

The thing is, it's not blocked, and my ports are open. I'm not sure what to do with it??