I click on this question
Then I go to the last page clicking on 22 (I use 50 results by page) at the bottom of the page. Everything is fine.
Then I click on 21 to see the previous page. The page is blank showing no result.
I have the same behavior when I click on 18, 19 and 20.
I tried to refresh the page as specified here, same result.
I use firefox 4.0.1 and IE 8.0.6001.18702CO on WinXP