Just installed the new BitDefender 2008 on VISTA and....this damned firewall blocks the UPNP discovery protocol which prevents my UPNP players from discovering TwonkyVision on my PC / VISTA....the previous BitDefender version was working fine (the v10 version).
Only when I disable the BitDefender 2008 firewall can my players find the Twonkymedia server.
I discussed with the support (in India), they of course and as usual advised me to do things I already tried 1,000 times before and which do not work (put the LAN in trusted zone, etc.).
If anyone has any idea...and my advice: avoid BitDefender 2008!