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After installing the beta designer p2 I created a test android application and when I double clicked to open the design MonoDevelop crashed with the following details (you will also get this report directly as I enabled sending reports automatically)
System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'System.Net.Sockets.Socket'.
at System.Net.Sockets.Socket.EndAccept(IAsyncResult asyncResult)
at System.Net.Sockets.TcpListener.EndAcceptTcpClient(IAsyncResult asyncResult)
at Xamarin.AndroidDesigner.JavaProcessConnection.OnConnected(IAsyncResult res)
at System.Net.LazyAsyncResult.Complete(IntPtr userToken)
at System.Net.ContextAwareResult.CompleteCallback(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Net.ContextAwareResult.Complete(IntPtr userToken)
at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
at System.Net.Sockets.BaseOverlappedAsyncResult.CompletionPortCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
I could not reproduce this exact error, but I think it is fixed. If you see it again with the most recent monodevelop version, please reopen.