Hi community, Anyone have ever got this problem trying to open Studio Pro? ystem.Security.Cryptography.CryptographicException: Chiave non utilizzabile nello stato specificato. in System.Security.Cryptography.ProtectedData.Unprotect(Byte[] encryptedData, Byte[] optionalEntropy, DataProtectionScope scope) in Mendix.Modeler.UserManagement.CredentialProtection.Decrypt(String encryptedBase64) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\UserManagement\CredentialProtection.cs:riga 28 in Mendix.Modeler.UserManagement.CredentialProtection.DecryptToSecureString(String encryptedBase64) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\UserManagement\CredentialProtection.cs:riga 35 in Mendix.Modeler.UserManagement.SignInControl.BuildWebBrowser() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.UserManagement\SignInControl.cs:riga 145 in Mendix.Modeler.UserManagement.SignInControl.get_WebBrowser() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.UserManagement\SignInControl.cs:riga 41 in Mendix.Modeler.UserManagement.SignInControl.BuildRightSide() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.UserManagement\SignInControl.cs:riga 123 in Mendix.Modeler.UserManagement.SignInControl.BuildLayout() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.UserManagement\SignInControl.cs:riga 92 in Mendix.Modeler.UserManagement.SignInControl.Initialize(Screen screen) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.UserManagement\SignInControl.cs:riga 63 in Mendix.Modeler.UserManagement.SignInMainForm..ctor(SignInControl content, Boolean isFirstTimeUser, IMainWindowManager mainWindowManager, ISignInManager signInManager) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.UserManagement\SignInMainForm.cs:riga 24 in Mendix.Modeler.UserManagement.SignInWindowFactory.CreateAsMainForm(AuthorizeRedirectHandler authorizeRedirectHandler, Action onClosed) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.UserManagement\SignInWindowFactory.cs:riga 38 in Mendix.Modeler.UserManagement.SignInUI.CreateAsMainForm() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.UserManagement\SignInUI.cs:riga 53 in Mendix.Modeler.UserManagement.SignInMainFormProvider.Create() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.UserManagement\SignInMainFormProvider.cs:riga 26 in System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() in System.Collections.Generic.Queue`1..ctor(IEnumerable`1 collection) in Mendix.Modeler.MainWindow.Program.<InitApplicationAsync>d__13.MoveNext() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.MainWindow\Program.cs:riga 139 System.NullReferenceException: Riferimento a un oggetto non impostato su un'istanza di oggetto. in Mendix.Modeler.MainWindow.Program.OnMainFormClosing(Object sender, EventArgs args) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.MainWindow\Program.cs:riga 157 in Eto.PropertyStore.TriggerEvent[T](Object key, Object sender, T args) in Eto.Forms.Window.OnClosing(CancelEventArgs e) in Eto.Forms.Window.Callback.OnClosing(Window widget, CancelEventArgs e) in Eto.Wpf.Forms.WpfWindow`3.Control_Closing(Object sender, CancelEventArgs e) in System.Windows.Window.OnClosing(CancelEventArgs e) in System.Windows.Window.WmClose() in System.Windows.Window.WindowFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) in System.Windows.Interop.HwndSource.PublicHooksFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) in MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) in MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) in System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) in System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) Thanks in advance! Ale