Silverlight security exception on accessing wcf data service - silverlight-4.0

Question

I am making a silverlight application which uses a wcf data service which is deployed on cloud. The WCF data service works perfectly on the browser,however when I use it as a dataservice query to populate the controls and use the loadasync method i get the below error.
I included the clientaccesspolicy.xml and crossdomain.xml and it is accessible and open to all domains.
I used fiddler but it isn't even trying to retrieve the clientaccesspolicy.xml file rather get the error before that.
Does anyone know how to find what is wrong at least?
e.Error
{System.InvalidOperationException: An error occurred while processing this request. ---> System.Security.SecurityException ---> System.Security.SecurityException: Security error.
at System.Net.Browser.ClientHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
at System.Net.Browser.ClientHttpWebRequest.<>c_DisplayClass5.b_4(Object sendState)
at System.Net.Browser.AsyncHelper.<>c_DisplayClass4.b_1(Object sendState)
--- End of inner exception stack trace ---
at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
at System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Data.Services.Http.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Data.Services.Client.QueryResult.AsyncEndGetResponse(IAsyncResult asyncResult)
--- End of inner exception stack trace ---
at System.Data.Services.Client.BaseAsyncResult.EndExecute[T](Object source, String method, IAsyncResult asyncResult)
at System.Data.Services.Client.QueryResult.EndExecute[TElement](Object source, IAsyncResult asyncResult)
at System.Data.Services.Client.DataServiceRequest.EndExecute[TElement](Object source, DataServiceContext context, IAsyncResult asyncResult)
at System.Data.Services.Client.DataServiceQuery1.EndExecute(IAsyncResult asyncResult)
at System.Data.Services.Client.DataServiceCollection1.<>c_DisplayClass2.b_1(IAsyncResult asyncResult)
at System.Data.Services.Client.DataServiceCollection1.<>c__DisplayClassd.<>c__DisplayClassf.<BeginLoadAsyncOperation>b__b()}
[System.InvalidOperationException]: {System.InvalidOperationException: An error occurred while processing this request. ---> System.Security.SecurityException ---> System.Security.SecurityException: Security error.
at System.Net.Browser.ClientHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
at System.Net.Browser.ClientHttpWebRequest.<>c__DisplayClass5.<EndGetResponse>b__4(Object sendState)
at System.Net.Browser.AsyncHelper.<>c__DisplayClass4.<BeginOnUI>b__1(Object sendState)
--- End of inner exception stack trace ---
at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
at System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Data.Services.Http.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Data.Services.Client.QueryResult.AsyncEndGetResponse(IAsyncResult asyncResult)
--- End of inner exception stack trace ---
at System.Data.Services.Client.BaseAsyncResult.EndExecute[T](Object source, String method, IAsyncResult asyncResult)
at System.Data.Services.Client.QueryResult.EndExecute[TElement](Object source, IAsyncResult asyncResult)
at System.Data.Services.Client.DataServiceRequest.EndExecute[TElement](Object source, DataServiceContext context, IAsyncResult asyncResult)
at System.Data.Services.Client.DataServiceQuery1.EndExecute(IAsyncResult asyncResult)
at System.Data.Services.Client.DataServiceCollection1.<>c__DisplayClass2.<LoadAsync>b__1(IAsyncResult asyncResult)
at System.Data.Services.Client.DataServiceCollection1.<>c_DisplayClassd.<>c_DisplayClassf.b_b()}
Data: {System.Collections.ListDictionaryInternal}
InnerException: {System.Security.SecurityException ---> System.Security.SecurityException: Security error.
at System.Net.Browser.ClientHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
at System.Net.Browser.ClientHttpWebRequest.<>c_DisplayClass5.b_4(Object sendState)
at System.Net.Browser.AsyncHelper.<>c_DisplayClass4.b_1(Object sendState)
--- End of inner exception stack trace ---
at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
at System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Data.Services.Http.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Data.Services.Client.QueryResult.AsyncEndGetResponse(IAsyncResult asyncResult)}
Message: "An error occurred while processing this request."
StackTrace: " at System.Data.Services.Client.BaseAsyncResult.EndExecute[T](Object source, String method, IAsyncResult asyncResult)\r\n at System.Data.Services.Client.QueryResult.EndExecute[TElement](Object source, IAsyncResult asyncResult)\r\n at System.Data.Services.Client.DataServiceRequest.EndExecute[TElement](Object source, DataServiceContext context, IAsyncResult asyncResult)\r\n at System.Data.Services.Client.DataServiceQuery1.EndExecute(IAsyncResult asyncResult)\r\n at System.Data.Services.Client.DataServiceCollection1.<>c_DisplayClass2.b_1(IAsyncResult asyncResult)\r\n at System.Data.Services.Client.DataServiceCollection`1.<>c_DisplayClassd.<>c_DisplayClassf.b_b()"

Answer 1

i had the same issue. i changed my clientaccesspolicy.xml to:
<?xml version="1.0" encoding="utf-8"?>
<access-policy>
<cross-domain-access>
<policy>
<allow-from http-request-headers="*">
<domain uri="*"/>
</allow-from>
<grant-to>
<resource path="/" include-subpaths="true"/>
</grant-to>
</policy>
</cross-domain-access>
</access-policy>
after clearing the browser-cache my clientaccesspolicy got loaded and it works fine.
hope that helps