jQuery Grid Plugin - jqGrid

Hello.  I recently downloaded jqGrid and trying to get the basic example to work with an existing jQuery UI implimentation (custom theme rolled css).

        
        jQuery(document).ready(function() {
            console.log('loaded...');
            jQuery("#list4").jqGrid({ 
                    id: 'poohandle',
                    url: 'inventory.php', 
                    datatype: "json", 
                    colNames:['Inv No','Date', 'Client', 'Amount','Tax','Total','Notes'], 
                    colModel:[  {name:'id',index:'id', width:55}, 
                                {name:'invdate',index:'invdate', width:90}, 
                                {name:'name',index:'name asc, invdate', width:100}, 
                                {name:'amount',index:'amount', width:80, align:"right"}, 
                                {name:'tax',index:'tax', width:80, align:"right"}, 
                                {name:'total',index:'total', width:80,align:"right"}, 
                                {name:'note',index:'note', width:150, sortable:false} ], 
                    rowNum:10, 
                    rowList:[10,20,30], 
                    pager: '#pager4', 
                    sortname: 'id', 
                    viewrecords: true, 
                    sortorder: "desc"                     
                    //caption: "JSON Example" 
            }); 
        });

My php file just ouputs static JSON (for testing). It appears that it's loading fine, aside from the styling looking like a yard sale, however it appears that a div (modal?) is all over the place and not allowing anything to be clicked.

When I load firebug to inspect the element, it tells me that this element is hoggingall my space:

<div id="lui_list4" class="ui-widget-overlay jqgrid-overlay"></div>

Have I loaded something incorrectly?  Seems like this could be common when mixing jquery-ui with the grid?  So far, removing the classes from that div makes it go away but that's not very clean, obviously.  All of my other jQuery-ui compontents  look fine throughout my site so not sure what's up with this.