seems that when $window(#).dw is used on a window which isn't viewable then it returns a wrong value.
on *:text:*:#: { echo # $window(#).dw }
say u have the window maximised and all nicklists the same width this will return different values depending on if the window is viewable or not.
it seems to take the width of the nicklist away from the size of the window twice for inactive windows.
it only happens when the windows in the mdi are maximised.
i hope i explained it well enough,.
this is on mirc 6.14 on win xp pro.