My guess is that you hit (Mark all items as read) near the upper right when Viewing New Content.
I have not found an easy way to reverse that, but you do have a couple of options:
1. The main forum page has a link near the bottom for Todays active content. It does just give you the last 24 hours, though:
2. Use Google. If you go to http://google.com and click on Advanced Search there is a link to "Dates, usage rights, numeric range, and more" near the bottom:
Enter brianenos.com in the field "Search within a site or domain" and select the "+Date, ...". Once you select that, you can then select "Past week" and hit "Advanced Search":
The default presentation will be "Sort by relevance".
If you click on "Sort by date" you will get them listed by last update time.
Google does not come scan the site very often looking for new content, so the content shown may be several hours old. That's ok, you can use the "Todays Active Content" from the BE main forum page for the last 24 hours and use google's list to look at posts more than 24 hours old.