When I set a theme, Izenda Reports broke or threw a javascript errors
Most likely this is caused by themes being applied to the Rs.aspx page. Themes can not be applied to this page. If you are setting themes globally, you can work around this limitation by setting the theme tag in the rs.aspx page header to blank as shown below.
<%@ Page language="c#" AutoEventWireup="false" Inherits="Izenda.AdHoc.ResponseServer, Izenda.AdHoc" Theme="" %>
Otherwise remove the theme from the Rs.aspx page.