In my ASP.NET WebForms page I have a Modal window that pops up. The javascript code for displaying this modal window is as follows:

function OpenMailAddressWin(subscriberContactRelationGid, routeId, btn) {

    window.showModalDialog(SubscriberSecondaryAddress.aspx + BuildQueryStringValuesForSubscriber(subscriberContactRelationGid, routeId, returntxtReceiptDate().value), this, strWindowFeatures + ;scroll:no;dialogWidth:442px;dialogHeight:350px);

    location.reload(true);

}

After the modal window is closed I need to refresh the parent page (hence the location.reload(true); statement at the end) in order for alterations made in the modal window to take affect.

Now the thing is that sometimes (not every time, infuriatingly) when I close this modal window I get a warning popup which says:

To display the webpage again, Internet Explorer needs to resend the information you've recently submitted.

If you were making a purchase, you should click Cancel to avoid a duplicate transaction. Otherwise, click Retry to display the webpage again.

Any ideas why this is happening?