jQuery Grid Plugin - jqGrid

Here is my code:

jQuery("#list").jqGrid({
        url:"/admin/devicelist",
        datatype:"json",
        colNames:['1','2','3','4','5','6','7','8','9','10','11'],
        colModel:[
                  {name:'1',index:'1',width:100,sorttype:"int",editable:true,search:true,editoptions:{readonly:true,size:12}},
                  {name:'2',index:'2',width:150,editable:true,editoptions:{size:50}},
                  {name:'3',index:'3',width:150,editable:true,editoptions:{size:50}},
                  {name:'4',index:'4',width:70,editable:true,edittype:"checkbox",editoptions:{value:"1:0"}},
                  {name:'5',index:'5',width:70,editable:true,edittype:"checkbox",editoptions:{value:"1:0"}},
                  {name:'6',index:'6',width:70,editable:true,edittype:"checkbox",editoptions:{value:"1:0"}},
                  {name:'7',index:'7',width:70,editable:true,edittype:"checkbox",editoptions:{value:"1:0"}},
                  {name:'8',index:'8',width:120,editable:true,editoptions:{size:10}},
                  {name:'9',index:'9',width:120,editable:true,editoptions:{size:10}},
                  {name:'10',index:'10',width:100,sorttype:"float",editable:true,editoptions:{size:10}},
                  {name:'11',index:'11',width:120,editable:true,edittype:"checkbox",editoptions:{value:"1:0"}}
                  ],
        hidegrid:false,
        width:550,
        height:400,
        rowNum:50,
        rowList:[50,100,150,200],
        shrinkToFit:false,
        pager:'#pager',
        sortname:'2',
        sortorder:"asc",
        viewrecords:true,
        caption:"Devices",
        editurl:"/admin/editdevice"
    });
    
    jQuery("#list").jqGrid('navGrid','#pager',
            {refresh:true,add:false,del:false,edit:true,search:true},
            {closeAfterEdit:true,closeOnEscape:true,recreateForm:true},
            {},
            {},
            {closeAfterSearch:true,closeAfterReset:true,closeOnEscape:true},
            {}
    );

I'm having a problem with my jqgrid where after performing a search, i press the refresh button which i expect would reset the results back to the unfiltered list, but it does nothing.

I'm assuming it is submitting, but the parameters being used in the search haven't been cleared, so it simply returns the search results again.

Is there any way around this? Am i missing something? I have googled and read up on forums for the past few hours and haven't had any luck finding any documentation on this.

Any help or adivice is appreciated!

Thanks in advance.

John