in version 1.30 the scriptManager was removed from the master page (Root.MasterPage) and now resides on pages that need it like products.aspx and account.aspx. so open those pages (they're the most important ones - i really don't care about others) and replace the script manager line(s) with
<ajaxToolkit:ToolkitScriptManager runat="Server" EnableScriptGlobalization="true"
EnableScriptLocalization="true" ID="ScriptManager1" LoadScriptsBeforeUI="false"
CombineScripts="true" ScriptMode="Release" />
next try adding EnableViewState=""false" to the header, header menu, footer, info block and other controls that don't use postback. some controls don't use postback but in the PageLoad event they have a condition if(!IsPostBack) BindData(); comment the if statement because they won't render on postback if viewstate is off.