Just to clarify this.
This "bug" does not affect main window, or chat windows, it affects desktop floating bars (these little bars floating on top other windows with contact names on it) and it affect scripts that use
OnEvent_ChatWndReceiveMessage and/or other functions/events.
Also, I'll repeat myself, this issue occur after some time WLM started (in my case its after a few hours), not immediately after start.
I'm not sure, but I think this only occur when a contact changed their status...
P.S. since this bug wasnt fixed, can moderators please remove [FIXED] tag from this topic's headline?