Same problem here. All is ok but… only if i disable avast firewall.
i starded after the last update to avast IS 2014.9.0.2008
Avast 2014.9.0.2008
Vuze 5.0.0.0/4 az3
Java 1.7.0_45 (32-64)
Windows 7 64

Tried to get help from support, they said to reinstall, but the problem remains. (Vuze is running in background but no UI, UI pops up after 15-20 minuts, it creates a new instance after 15-20 minuts for each torrent launched)

If it works only if i disable avast, what’s the point to pay for that?