"New posts" basically refers to the new posts that have been made since your last "visit". These get cleared pretty quickly, as new posts are made when you are "visiting" and MyBB places more importance on these.
The "Today's Posts" search is my preferred option, since it will always show the posts made in the last 24 without fail (or you can change that time period by adding "&days=x" to the search URL: http://atheistforums.org/search.php?action=getdaily
So if you want to see all the posts in the last week, click this: http://atheistforums.org/search.php?acti...ily&days=7
I've had a look at the unread posts plugin, but it looks quite bloated for what people need.
The "Today's Posts" search is my preferred option, since it will always show the posts made in the last 24 without fail (or you can change that time period by adding "&days=x" to the search URL: http://atheistforums.org/search.php?action=getdaily
So if you want to see all the posts in the last week, click this: http://atheistforums.org/search.php?acti...ily&days=7
I've had a look at the unread posts plugin, but it looks quite bloated for what people need.