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Can you describe in more detail the symptoms... on a quick visit I cannot see anything wrong.
Does it happen for both anonymous and registered users? I've noticed a problem on xoops.org where if I log in and jump to a *long* thread (i.e. many posts) from a notification PM, I get only the first 'page' of results. No links to the other pages in the thread. If I click on 'Flat' then I get the same page but with the numbers of the additional pages. Could this be the same problem you are having?