I'm able to get the conversion tracking to work with a simple test I landing page configured:
<h4>test tracking script</h4>
<script type="text/javascript" src="http://<!-- MID GOES HERE -->.collect.igodigital.com/collect.js"></script>
<h4>test tracking pageview</h4>
<script type="text/javascript">
_etmc.push(["setOrgId", "<!-- MID GOES HERE -->"]);
_etmc.push(["trackPageView"]);
</script>
<h4>test conversion script</h4>
<script type="text/javascript">
_etmc.push(["setOrgId", "<!-- MID GOES HERE -->"]);
_etmc.push(["trackConversion", { "cart": [
{"item" : "ITEM1", "quantity": "1" , "price" : "1.00" , "unique_id" : "ITEM1" } ,
{"item" : "ITEM2", "quantity": "1" , "price" : "1.23" , "unique_id" : "ITEM2" }],
// OPTIONAL PARAMETERS
"order_number" : "1234567890",
"discount" : "0.50",
"shipping" : "2.34",
"details" : { "AttributeName" : "Value" }
// END OPTIONAL PARAMETERS
}]);
</script>
Result

collect.js
?