I also experience a similar problem that throws up:
Server Error in '/' Application.
Unexpected XML declaration. The XML declaration must be the first node in the document, and no white space characters are allowed to appear before it. Line 1, position 26.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Xml.XmlException: Unexpected XML declaration. The XML declaration must be the first node in the document, and no white space characters are allowed to appear before it. Line 1, position 26.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[XmlException: Unexpected XML declaration. The XML declaration must be the first node in the document, and no white space characters are allowed to appear before it. Line 1, position 26.]
System.Xml.XmlTextReaderImpl.Throw(Exception e) +73
System.Xml.XmlTextReaderImpl.Throw(String res, String arg) +122
System.Xml.XmlTextReaderImpl.ParsePI(StringBuilder piInDtdStringBuilder) +195
System.Xml.XmlTextReaderImpl.ParseDocumentContent() +4114235
System.Xml.XmlTextReaderImpl.Read() +145
System.Xml.XmlTextReader.Read() +15
System.Xml.XmlReader.ReadToFollowing(String name) +103
WebWizUserDetails.LoadByXML(XmlReader Data) +36
WebWizUserDetails..ctor(String Username) +34
UserProfile.Page_Load(Object sender, EventArgs e) +3727
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
System.Web.UI.Control.OnLoad(EventArgs e) +91
System.Web.UI.Control.LoadRecursive() +74
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272