SmartNagivation is turned off as it causes issues with a javascript dropdown menu I am using on the page.
EnableViewState is true
The page posts back when user clicks on a datagrid item. The headers can also be clicked on to change sorting order.
I don't think the problem lies within this page per se. The problem occurs only when there are more than say 200 items listed in the grid and click on a hyperlinked item in the grid which sends the user to another page displaying details about that item, the back button on browser's toolbar becomes disabled.
If the number of items in the grid is not over 200 (for example), the user can go to the details page for the item and the browser back button works just fine.