This problem relates to mime types, if you navigate there you will find a message reporting duplicate mime types. Please verify if your IIS application configuration file has the BizTalk360 section correctly setup (normally located under: C:\Windows\System32\inetsrv\config\applicationHost.config):

    <location path="Default Web Site/BizTalk360">



                <access sslFlags="Ssl, SslNegotiateCert, SslRequireCert" />


                    <windowsAuthentication enabled="true" />

                    <anonymousAuthentication enabled="false" />

                    <digestAuthentication enabled="false" />

                    <basicAuthentication enabled="false" />





                    <clear />

                    <clear />

                    <add value="Default.aspx" />




                <remove fileExtension=".xbap" />

                <remove fileExtension=".xap" />

                <remove fileExtension=".xaml" />

                <mimeMap fileExtension=".xaml" mimeType="application/xaml+xml" />

                <mimeMap fileExtension=".xap" mimeType="application/x-silverlight-app" />

                <mimeMap fileExtension=".xbap" mimeType="application/x-ms-xbap" />




The remove instruction is the important piece here to avoid the duplicates. Make sure you enter this and reset iis to get your images working.