Change "view new posts"
 

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Sorry for the wait to reply but it took a few days to get a solution. I cannot change the view last posts function without wrecking that function because you are bound to have different results with that search depending on how long it has been since your last visit. What we were able to do though is add a new search function that will allow you to search the last XX number of days for all posts during those days. You can find this new search function at the top of the search page by clicking the search link at the top of the forums. Hope this helps :)