I have the same problem in Windows Vista however it work most of the time but sometimes not (My Firefly server is installed on Ubuntu and I am using it with Vista and Mac clients: the Mac client don’t experience connectivity problems). In Vista sometimes the Shared list appears but then out of a suddenly gets disconnected and it dissappears. I found out that it had something to do with the wirless network settings on the Windows PC. Connecting/disconnecting from it will bring back the the Shared Folder. Still not sure what causes it not to discover the FireFly server anymore.