Have you tried the FW Connection installer?
Is FW port forwarded or use UPnP?
If the connection installer fails, try going to settings & disable some of the options such as Tools > Options > Advanced > Performance > DHT or/and TLS

FW usually no problem for me, but with LW 4 I always needed to disable one of those options, can't remember which.

Edit: I had not used FW in many months, but just fired it up on OSX 10.6 & it took about 20 seconds to fully connect. My FW does not have any advanced options disabled however. And dare I say it, one of the hosts it connected to was a spambot I noted a month ago.