DropdownExtender does not position when the target is positioned withing an "absolute" or "relative" div. Even for the AJAX Dropdown sample
It started after installing the latest build (Build 10301) . Even the slightest modification of the Ajax dropdown example to position the target element creates this problem

Example code: -- same as dropdown example in the AJAX Samples: (For the sample, the problem occurs with either "relative" or "absolute")

<div style="position: relative">

<asp:Label ID="TextLabel" runat="server" Text="Hover Over Me" Font-Names="Tahoma" Font-Size="11px" Style="display: block; width: 300px; padding:2px; padding-right: 50px;" />

</div>

<asp:Panel ID="DropPanel" runat="server" CssClass="ContextMenuPanel" Style="display:none;visibility:hidden;">

<asp:LinkButton runat="server" ID="Option1" Text="Option 1" CssClass="ContextMenuItem" />

<asp:LinkButton runat="server" ID="Option2" Text="Option 2" CssClass="ContextMenuItem" />

<asp:LinkButton runat="server" ID="Option3" Text="Option 3 (Click Me!)" CssClass="ContextMenuItem" />

</asp:Panel>

<ajaxToolkit:DropDownExtender runat="server" ID="DDE" TargetControlID="TextLabel" DropDownControlID="DropPanel" />