How to troubleshoot jQuery AJAX apparently not submitting

This is a multipart form, so I am using FormData.

<form id="PriceForm" name="PriceForm" method="post" enctype="multipart/form-data" accept-charset="UTF-8">

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I am using this same code in 2 other modules, and it is working fine. It appears it is not even reaching the PHP file, and I have run out of ideas to troubleshoot.
In the code below, I am pressing the "Save" button, which is recognized, and I have verified that it is sending correctly populated variables to DataSave.
Validation comes back positive (also verified)

What I have done to troubleshoot
1. Verified, line by line, that the code sequence is identical to what is working elsewhere.
2. Placed error information in the PHP file ($Error[] = "Testing";)
3. Finally, created a simple test file (shown at bottom) to return a result. There was no change, so it does not seem to be in the PHP file.

The button listener (I am selecting the "Save" button)

$(document).ready(function()
{
   $(document).on('click', '.SubmitButton', function(e)
   {
      e.preventDefault();
      var ButtonID = $(this).attr('id');
      var Form = $('#PriceForm');
      var Validate = false;
      if(ButtonID == "Reset")
      {
         if(confirm("Did you mean to clear the form?") == true)
         {
            ClearURI();
            window.location="pricing.php";
         }
      }
      else if(ButtonID == "Save")
      {
         var Data = new FormData(Form[0]);
         Data.append( 'Sec', "PricingSave" );
         Data.append( 'Process', "Save" );
         Validate = "Store"; 
      }
      else if(ButtonID == "Next")
      {
         var Data = new FormData(Form[0]);
         Data.append( 'Sec', "PricingSave" );
         Data.append( 'Process', "Next" );
         Validate = "All"; // Perform Validation
      }
      DataSave(Data,ButtonID,Validate)
   });

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});
The Ajax code (DataSave) looks like this:

$(document).ready(function()
{
   function DataSave(Data,ButtonID,Validate)
   {
      Valid = FormVal(Validate)
      console.log("valid: "+Valid);
      console.log(Data);
      console.log(ButtonID)
      console.log(Validate)
      if(Valid)
      {
         console.log("Valid verified");
         $.ajax(
         {
            url: 'Ajax-Forms.php',
            type: 'POST',
            data: Data,
            dataType: 'JSON',
            cache: false,
            contentType: false,
            processData: false,
            success: function (data)
            {
               console.log(data.SuccessMessage);
               console.log(data.ID);

               if(data.SuccessMessage == "ERROR!")
               {
                  var ErCount = data.ErCount;
                  var dString = "ERROR!"+"\n";
                  for(i=0;i<ErCount;i++)
                  {
                     dString += data.Error[i]+"\n";
                  }
                  alert(dString);
                  return false;
               }
               else if(ButtonID == "Save")
               {
                  alert(data.SuccessMessage+"\n"+"The process number is "+data.AppID);
                  ClearURI();
                  location.reload(true);
               }
               else if(ButtonID == "Next")
               {
                  var ID = data.ID;
                  TempAlert(data.SuccessMessage,3000);
                  setTimeout(function(){location.href="ca.php?AppKey="+ID} , 1005);
               }
            }
         });
      }
   }
});

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Here is the only console log response

valid: true
FormData {  }
Save
Store
Valid verified

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The PHP file does many procedures, and ends with this

if(count($Error) == 0)
{
   echo json_encode(array("SuccessMessage"=>$SuccessMessage, "ID"=>$ID, "AppID"=>$AppID));
}
else
{
   $ErCount = count($Error);
   $SuccessMessage = "ERROR!";
   echo json_encode(array("SuccessMessage"=>$SuccessMessage, "ErCount"=>$ErCount, "Error"=>$Error));
}

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I created a simple test file that looked like this. The response was the same

$SuccessMessage = "Testing";
$Error[] = "This is an error";
if(count($Error) == 0)
{
   echo json_encode(array("SuccessMessage"=>$SuccessMessage, "ID"=>$ID, "AppID"=>$AppID));
}
else
{
   $ErCount = count($Error);
   $SuccessMessage = "ERROR!";
   echo json_encode(array("SuccessMessage"=>$SuccessMessage, "ErCount"=>$ErCount, "Error"=>$Error));
}

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Since I cannot put alerts in the PHP file, I don't know how to determine if it is even going there. I did put test errors at the top of the page and elsewhere.