INFO [2016-03-26 00:05:52Z]: Starting Xamarin Studio 5.10.3 (build 26) INFO [2016-03-26 00:05:52Z]: Running on Microsoft .NET 4.0.30319.34209 INFO [2016-03-26 00:05:52Z]: Operating System: Windows 6.3.9600.0 (64-bit) INFO [2016-03-26 00:05:52Z]: Found GTK# version 2.12.30 INFO [2016-03-26 00:05:52Z]: Using GTK+ 2.24.23 INFO [2016-03-26 00:06:05Z]: Add-in loaded: MonoDevelop.Core INFO [2016-03-26 00:06:05Z]: Add-in loaded: MonoDevelop.Ide System.TypeInitializationException: The type initializer for 'MonoDevelop.Core.Web.ProxyCache' threw an exception. ---> System.Net.Sockets.SocketException: A system call has failed at System.Net.Sockets.Socket.InitializeSockets() at System.Net.NetworkAddressChangePolled..ctor() at System.Net.AutoWebProxyScriptEngine.AutoDetector.Initialize() at System.Net.AutoWebProxyScriptEngine.AutoDetector.get_CurrentAutoDetector() at System.Net.AutoWebProxyScriptEngine..ctor(WebProxy proxy, Boolean useRegistry) at System.Net.WebProxy.UnsafeUpdateFromRegistry() at System.Net.WebRequest.InternalGetSystemWebProxy() at System.Net.WebRequest.GetSystemWebProxy() at MonoDevelop.Core.Web.ProxyCache..cctor() --- End of inner exception stack trace --- at MonoDevelop.Core.Web.ProxyCache..ctor() at MonoDevelop.Core.WebRequestHelper.Initialize() at MonoDevelop.Core.Runtime.Initialize(Boolean updateAddinRegistry) Starting Xamarin Studio FATAL ERROR [2016-03-26 00:06:05Z]: Xamarin Studio failed to start. Some of the assemblies required to run Xamarin Studio (for example gtk-sharp)may not be properly installed in the GAC. System.Net.Sockets.SocketException (0x80004005): A system call has failed at System.Net.Sockets.Socket.InitializeSockets() at System.Net.Sockets.Socket..ctor(AddressFamily addressFamily, SocketType socketType, ProtocolType protocolType) at MonoDevelop.Ide.IdeStartup.Run(MonoDevelopOptions options) at MonoDevelop.Ide.IdeStartup.Main(String[] args, IdeCustomizer customizer)