reporting services - Cascading Parameter SSRS Report hangs on Production Server -

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i have report in used 2 multivalue parameters affiliate, tfn. both fetch available values using query. affiliate independent while tfn list populated once affiliate selected. report works fine when run in development mode in ssrs. when deploy, gets stuck after select first parameter, affiliate. buttons grayed out , i'll have re-run report. report gets stuck, regardless of tfn result set size.

any highly appreciated.

add scriptmode="release" scriptmanager object on aspx webpage 

<asp:scriptmanager id="scriptmanager1" runat="server" scriptmode="release"> </asp:scriptmanager>

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