I've had a wierd lag today. I've heard a beep sound, but nobody was calling my name neither in public nor private chat. Only some minutes later I saw a PM directed to me. Just letting you know
UPD: When someone PMs me, I hear beep sound, but the tab doesn't show up. But if I hover the tab area with mouse, it appears
UPD2: I see some duplicated names on the right list of players, type of ghost names