I can't seem to find this mentioned anywhere, but when I'm chatting in the relay browser, messages regularly fail to appear. Sometimes they're mine, sometimes other people's. They don't seem to have anything in common; it seems to be random.
It seems to occur regardless of how chat-related preferences are set, but I can post that info if it would be helpful.
If I have Mafia's chat window open as well, I seem to get all the messages there, but other messages are randomly duplicated (usually not the same messages that disappear from relay chat).
Is anyone else experiencing this?