When a player connect to lobby (IRC) chat and later connects to a (or starts hosting a) gameserver then it happens in some cases that this players' MegaGlest will not emit the "connecting to: [servername]" or "tries to create a game" string, and the player seems to remain in the lobby when she really connected to the gamserver. This means that other players assume this person is present in chat and can read text written there while factually the player will miss all text written and will only get to see text written after she returns to the lobby (if so).
It is unclear why this happens sometimes and not other times - in most cases this is not a problem. It seems that this issue was introduced as a side effect of connection caching, it has never been observed before this change.
I have no personally been able to reproduce it, so we may need more information from someone who can. My understanding is, though, this happens quite sporadically and it's not something you can easily reproduce just because it happened to you once.