Found the solution :
In the
web.config file comment out the following line.
<!--<pages buffer="true"
enableSessionState="true" autoEventWireup="true"
maintainScrollPositionOnPostBack="true"
masterPageFile="~/MasterPage/BPHO3.master"
styleSheetTheme="Current"/>-->
I think the page was trying to display using the master page or the maintainscrollposition was not working ....