Hello,
I just upgraded from 6.21 to 6.3.
In mIRC 6.21 the message highlight (alt-o -> display -> message color dropbox) did work for me like the following:
If a channel window is minimized (and only if it is minimized) the corresponding icon in the switchbar get colored if there is a new message.
In mIRC 6.3 it is similar, but only if the main mIRC window is on top. If the mIRC window is not the active one every channel icon in the switchbar gets colored, doesn't matter if its minimized or not.
Is it possible to get the old behavior back? Didn't find any option for this, nor a notice of change in the changelog for it.