New Post: Issues Cascading 2 MultiSelects

As a start, if you add in the lines below that I've highlighted (with "__" each side), you should get the raw response from SPServices, which will hopefully give us an idea of what is going wrong?

<script language="javascript" src="/sites/dsp/SiteAssets/jquery-1.8.3.min.js" type="text/javascript"></script>
<script language="javascript" src="/sites/dsp/SiteAssets/jquery.SPServices-2013.01.min.js" type="text/javascript"></script>

<script language="javascript" type="text/javascript">
 ExecuteOrDelayUntilScriptLoaded(loadCascadingDDL, "sp.js");

function loadCascadingDDL() 
{
 $().SPServices.SPCascadeDropdowns({
   relationshipList: "Systems",
   relationshipListParentColumn: "Region",
   relationshipListChildColumn: "RegionName",
   parentColumn: "Region",
   childColumn: "System",
 __   completefunc: function (xData, Status) {
        alert(xData.responseText);
    }__
 });
 }
</script>