Have you test with public IP? (like using your mobile phone with 3G and test your site).

Some network might mask the IP, and l think the IClientIPAddressResolver cannot get your IP.

/// <summary>
        /// Gets client IP address.
        /// </summary>
        /// <returns>IP address string</returns>
        private string GetClientIPAddress()
        {
            var clientIPAddressResolver = ServiceLocator.Current.GetInstance<IClientIPAddressResolver>();

            var clientIPAddress = clientIPAddressResolver.ResolveAddress(new HttpContextWrapper(HttpContext.Current)).ToString();
            if (clientIPAddress.Equals("::1", StringComparison.OrdinalIgnoreCase))
            {
                return string.Empty;
            }

            return clientIPAddress;
        }

Thanx for reply!

It seems that the reason was freegeoip.net service though. It statrted to serve the requests and hidden profiling works as expected now.