I have a patch to fix this issue, along with the other issue where the Related Links datatype is affected by Page Notifications - postbacks aren't honoured and related links are not saved.

I think the core issue comes down to modification of the controls collection breaking Related Links.

To fix, grab the source from codeplex and update the ShowNotifications method from:

        protected void ShowNotification(ContentPlaceHolder placeHolder, string msg)
        {
            var panel = new Panel();
            panel.Style.Add("background-color", "#fff9c2");
            panel.Style.Add("border", "solid 1px #ffd800");
            panel.Style.Add("color", "#333333");
            panel.Style.Add("padding", "10px");
            panel.Style.Add("margin-bottom", "10px");

            var literal = new Literal();
            literal.Text = msg;

            panel.Controls.Add(literal);

            placeHolder.Controls.AddAt(0, panel);
        }

to:

protected void ShowNotification(ContentPlaceHolder placeHolder, string msg)
{
    placeHolder.Controls.Add(new Literal
    {
      Text = String.Format("<script type=\"text/javascript\">\n$(function(){{ " +
                           "$(\"div.tabpageContent\").prepend(\"" + 
                           "<div style='background-color:#fff9c2;border:solid 1px #ffd800;" +
                           "color:#333;padding:10px;margin-top:10px;text-align:left'>{0}</div>\"); }});\n</script>\n", msg) });
}

Which uses jQuery at the bottom of the control collection (does not seem to affect Related Links) to prepend a message to the top of the page (inside the scrollable container).

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