Port WebParts from 4.0 to 4.5, drag-n-drop not working

Hi:
I have a site that was created using 4.0 WebParts (this is NOT SharePoint site).  I have tried to port the site to 4.5, but the drag-n-drop does not work.  I added the following two scripts to the master page (per fiddler they are loaded):
<script src="/Scripts/WebForms/WebForms.js" type="text/javascript"></script> <script src="/Scripts/WebForms/WebParts.js" type="text/javascript"></script> I have seen the following, but it does not present a solution:
http://forums.asp.net/t/1981763.aspx?Unable+to+drag+and+drop+Webparts+net+4+5+VS+2012
Phil