ajaxToolkit:AutoCompleteExtender does not work in production

I have a VS2010 ASP.Net web app that uses the ajaxToolkit:AutoCompleteExtender. When I am developing the application and run the app from VS2010, everything works. But when I publish the app to QA or production or even a local site on my PC, the ajaxToolkit:AutoCompleteExtender does not do anything. I get no errors, just nothing happens as it does in development.

Below is my AutoCompleteExtender control. When a user starts typing into the textbox, the "PerformSearch" service method is suppose to be called and a drop down appears. However, when I begin typing, nothing happens. The service method is never called.

Am I missing a file when Publishing that needs deployed?

<ajaxToolkit:AutoCompleteExtender
               runat="server" 
                BehaviorID="AutoCompleteEx"
                ID="autoComplete1" 
                TargetControlID="cboPartno"
                ServicePath="..\AutoComplete.asmx" 
                ServiceMethod="PerformSearch"
                MinimumPrefixLength="2" 
                CompletionInterval="1000"
                EnableCaching="true"
                CompletionSetCount="20"
                CompletionListCssClass="autocomplete_completionListElement" 
                CompletionListItemCssClass="autocomplete_listItem" 
                CompletionListHighlightedItemCssClass="autocomplete_highlightedListItem"
                DelimiterCharacters=";, :"
                ShowOnlyCurrentWordInCompletionListItem="true" ><Animations><OnShow><Sequence><%-- Make the completion list transparent and then show it --%><OpacityAction Opacity="0" /><HideAction Visible="true" /><%--Cache the original size of the completion list the first time
                                the animation is played and then set it to zero --%><ScriptAction Script="
                                // Cache the size and setup the initial size
                                var behavior = $find('AutoCompleteEx');
                                if (!behavior._height) {
                                    var target = behavior.get_completionList();
                                    behavior._height = target.offsetHeight - 2;
                                    target.style.height = '0px';
                                }" /><%-- Expand from 0px to the appropriate size while fading in --%><Parallel Duration=".4"><FadeIn /><Length PropertyKey="height" StartValue="0" EndValueScript="$find('AutoCompleteEx')._height" /></Parallel></Sequence></OnShow><OnHide><%-- Collapse down to 0px and fade out --%><Parallel Duration=".4"><FadeOut /><Length PropertyKey="height" StartValueScript="$find('AutoCompleteEx')._height" EndValue="0" /></Parallel></OnHide></Animations></ajaxToolkit:AutoCompleteExtender>