I'm having an issue where the following code is working perfect in Chrome and FF but is dying on the bold/italic line in IE.  No error is thrown that I can tell, I have a try catch block that is printing to a text file any errors that are thrown.  This is a custom workflow for contour that adds a new contact to Constant Contact. The address variable is "https://api.constantcontact.com/ws/customers/[username]/contacts.  The contentType is "application/atom+xml".  The requestMethod is "POST".  The data is XML as shown below the code.  One thing I feel I should mention is that the username is an email address.  I'm assuming that this should be URL encoded. 

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(address);
            request.Credentials = CreateCredentialCache(address, authenticationData);
            request.Method = requestMethod;
            request.ContentType = contentType;
            request.PreAuthenticate = true;
            request.ContentLength = data.Length;
            Stream stream = request.GetRequestStream();
            stream.Write(data, 0, data.Length);
            Stream responseStream = Stream.Null;
            try
            {
 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Console.WriteLine(String.Format(CultureInfo.InvariantCulture,
                                                "Method {0}, response description: {1}", request.Method,
                                                response.StatusDescription));

                if (response.StatusCode == HttpStatusCode.NoContent)
                {
                    return Stream.Null;
                }
                responseStream = response.GetResponseStream();
                MemoryStream memoryStream = ReadResponseStream(responseStream);
                return memoryStream;
            }
            catch (Exception ex)
            {
                Logging.LogError("GetResponseStream: " + ex.Message);
            }
            finally
            {
                stream.Close();
                responseStream.Close();
            }
            return Stream.Null;

<entry xmlns="http://www.w3.org/2005/Atom">
    <title type="text"></title>
    <updated>2008-07-23T14:21:06.407Z</updated>
    <author></author>
    <id>data:,none</id>
    <summary type="text">Contact</summary>
    <content type="application/vnd.ctct+xml">
        <Contact xmlns="http://ws.constantcontact.com/ns/1.0/">
            <EmailAddress>[email protected]</EmailAddress>
            <FirstName>s</FirstName>
            <MiddleName></MiddleName>
            <LastName>j</LastName>
            <HomePhone>7</HomePhone>
            <Addr1></Addr1>
            <Addr2></Addr2>
            <Addr3></Addr3>
            <City></City>
            <StateCode></StateCode>
            <StateName></StateName>
            <PostalCode></PostalCode>
            <SubPostalCode></SubPostalCode>
            <CountryCode></CountryCode>
            <CompanyName>m</CompanyName>
            <JobTitle>i</JobTitle>
            <WorkPhone></WorkPhone>
            <EmailType>HTML</EmailType>
            <OptInSource>ACTION_BY_CONTACT</OptInSource>
            <Note></Note>
            <CustomField1></CustomField1>
            <CustomField2></CustomField2>
            <CustomField3></CustomField3>
            <CustomField4></CustomField4>
            <CustomField5></CustomField5>
            <CustomField6></CustomField6>
            <CustomField7></CustomField7>
            <CustomField8></CustomField8>
            <CustomField9></CustomField9>
            <CustomField10></CustomField10>
            <CustomField11></CustomField11>
            <CustomField12></CustomField12>
            <CustomField13></CustomField13>
            <CustomField14></CustomField14>
            <CustomField15></CustomField15>
            <ContactLists>
                <ContactList id="https://api.constantcontact.com/ws/customers/[username]/lists/37"/>
                <ContactList id="https://api.constantcontact.com/ws/customers/[username]/lists/39"/>
            </ContactLists>
        </Contact>
    </content>
</entry>