Question for those that are extremely more intelligent than I....

I loved this feature on the old board as it helped me do a quick glance to see what was newly posted since the last time I visited. But I've noticed with this new version that it's not working the same. As long as I have the same window open and come back to visit the page it works. But if I close out the window (and actually do some work for a little while) all of the old threads that I've read show up as having a new post when I come back. The only way I can get it to work for me is if I actually log out and log back in before closing out the window.

Is there a setting on my computer that I should change to take care of this or is there something that can be done to solve this problem. I know it's a matter of 3-5 seconds, but it would be nice just to hit that button as I leave the site.

Any advice would be appreciated!