If you are having problems with your clients browser not being updated with the latest .xap in your loader aspx or html page. You need to add the follwoing to your URL.
I am Free lance .NET Architect / Programmer. I have Been developing in c# from the early days of Beta in 2001. I have written Iphone Apps, Windows Phone Apps, ASP.net, Windows Mobile, windows forms, Silverlight, WCF Webservices, ASP.Net Webservices, Remoting, Device Interface, SQL Server,Oracle, Postgresql, Jquery and the list goes on.