Strange situation, which I hope I can describe adequately ... normally when I have the Active Threads list on my screen, I can identify those threads I've already accessed because they appear in purple, whereas the ones I haven't yet looked at are blue. Today, everything's blue!
I've checked to see if there's something awry with the settings on my laptop, but this problem doesn't appear elsewhere (e.g. Google pages), so it appears to be specific to MN. Any ideas?