Actually I think this should be changed back to the way it was. Not only should the active window not be highlighted when mIRC isn't the active application, but the switchbar button for the active window should not raise on mouseover when mIRC isn't the active application. It's just odd behavior and I don't care what anyone says, it shouldn't behave that way.

~ Edit ~

shizno, the threat of downgrading and/or finding an alternative client is old and worn out and just makes you look stupid.