Umbraco 4.7.2 + Contour 1.1.12

I have been creating a user generated content system using Contour and have got everything in the creation/management 'toolbox' sorted, but if I delete a record (front-end as user), when I open to edit another still existing record, the form is blank, eg: no editing capabilities, or existing record values ouput to the form.

When I create new content and approve the record, the forms all are populating as normal. It's like the delete somehow knocks out the connection to the renderform macro? Or at least the AllowEditing property??? Also tried while front-end form edit doesn't work, i can still edit the record through back-office contour > previewFormDialog as usual.

Has anyone experienced this? Any thoughts appreciated ;)

Thanks!

Code for delete looks like this:

public void doDelete()
  {
    bool del = false;
    if(Request.QueryString["recordGuid"]!=null && IsGUID(Request.QueryString["recordGuid"])) {
      Guid rGuid = new Guid(Request.QueryString["recordGuid"]);
      Umbraco.Forms.Data.Storage.RecordStorage storage = new Umbraco.Forms.Data.Storage.RecordStorage();
      Umbraco.Forms.Core.Record record = storage.GetRecord(rGuid);
      Umbraco.Forms.Core.Services.RecordService rs = new Umbraco.Forms.Core.Services.RecordService(record);
      
      if(record.GetRecordField("node").ValuesAsString()!="") {
        Document doc = new Document(Convert.ToInt32(record.GetRecordField("node").ValuesAsString()));
        doc.UnPublish();
        doc.delete(true);
        umbraco.library.RefreshContent();
       
        rs.Delete();
        rs.Dispose();
        del = true;
        Response.Redirect("?note=Record has been deleted");
      }
    } 
    if(!del){
      Response.Redirect("?error=Delete failed");
    }
  }

Code on page:
----

<% if(Request.QueryString["recordGuid"] != null && canEdit) { %>
      <a class="button delete confirm" title="Delete the Band" href="?recordGuid=<%= Request.QueryString["recordGuid"]%>&amp;delete=true">
        <span>Delete</span>
      </a>
    <legend>Edit the band details of... "<%= band %>"</legend>
    <umbraco:Macro FormGuid="9e79f071-1ce8-46b2-81f0-1f489e4d69bf" AllowEditing="1" SubmitButtonText="Preview" Alias="umbracoContour.RenderForm" runat="server"></umbraco:Macro>
<% } %>