Flash version simply doesn't work - room list doesn't load, can't connect to known room after typing in its name. Chrome on Win7, everything up to date, but corporate firewalled network (allows HTTP/port 80 traffic only...)

As above! I can put a name in, register it OK, but then it just balks. Room list never finishes loading in. Type in the name of a known room and hit "Connect to room" and it just sits there saying "connecting" forever. Had a look in the FAQ, etc, and I can't see any clues as to whether I need a particular port-forwarding setup, UTP whitelisting or whatever.