No, because I was not presented with anything to read. Thanks to Young Gun and Cap'n Chaos I tracked down a thread explaining that a change was made, and I have to say (as I did in that thread) that the change makes no sense, and the proposed work-around makes no sense.
There should be an option to highlight threads posted or updated since a member's last visit. That's what most vBulletin forums use, and I respectfully submit that's what most people expect. It doesn't expire due to inactivity ... ever. It changes when a member logs out or navigates away from the vBulletin site, and it updates to a new "Since last visit" time/date marker the next time the member comes back to the site.