I just submitted a Help ticket on this.
I belong to a art site and it is very exclusive and you can't get into their forums unless you are a member.
eliminated, or perhaps relocate and/or renamed ?
If i enter a Topic, and without doing anything else ..ie i'm still on the first page of the topic.. i have to click the back arrow 2x before it takes me out of the Thread.
Using Windows 7 and Firefox browser.. on a Lenovo Thinkpad.
It does appear there is a full week of history. However, there is also a bug: the Last button functions the same as the Next button, so you have to keep clicking it to get to the true end of the list (or edit the offset parameter in the URL on the address bar...)