Hi,
If you click the Back button a couple of times it will go back to the previous URL.

To change the Pop-up Blocker settings?

Open Internet Explorer.
On the Tools menu, point to Pop-up Blocker, and then click Pop-up Blocker Settings.

>>I think it is the new popup killer in SP2 doing it's work.
>
>But, I am in the same window. Could just hitting the back button fires some options of that popup killer feature?