Just a note, I have been reported that some are getting an error when using the latest version of Umbraco (> 7.5.4) with Chrome.

Solution is to amend web.config as follows

<location path="umbraco">
    <system.webServer>
      <urlCompression doStaticCompression="false" doDynamicCompression="false" dynamicCompressionBeforeCache="false" />
      <httpProtocol>
        <customHeaders>
          <remove name="X-Frame-Options" />
          <add name="X-Frame-Options" value="SAMEORIGIN" />
          <remove name="Content-Security-Policy" />
          <add name="Content-Security-Policy" value="default-src 'self' www.gravatar.com player.vimeo.com *.vimeocdn.com packages.umbraco.org our.umbraco.org;script-src 'self' 'unsafe-inline' 'unsafe-eval' maps.googleapis.com;style-src 'self' 'unsafe-inline' maps.googleapis.com;img-src 'self' data: www.gravatar.com umbraco.tv maps.googleapis.com;font-src 'self';" />
        </customHeaders>
      </httpProtocol>
    </system.webServer>
  </location>

Consider this a temporary solution to the problem.