I've noticed that when 'Use single message window' option is checked (Options > IRC) it only places Queries in the singal message window, not notices, even though in the help file it says:

Quote:
This directs all private messages or notices from other users to one single message window. You will need to use the /msg command to reply. If you want to open a query window to a user, use the /query window.



Ninko