I installed version 4 and now my PS3 can't see my PC. I have gone in and added a port set with all ports that microsoft says needs to be open for sharing. I also went into my network security policy and added wmpnetwk.exe as a custom with no luck. I know it is the firewall because if I disable the firewall temporarily my PC pops right up.
For my port set:
5004 - 5005
50004 - 50013
For my application settings I have it set to allow TCP or UDP in/out from IP any to IP any where source and destination ports are in my port set.