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У меня ошибка при попытке войти в Xamarin IDE для Mac OS X: 
Неизвестное Ошибка активации
System.FormatException: One of the identified items was in an invalid format.
at Xamarin.Components.Ide.Activation.ActivationService.GetErrorWorkflow (Xamarin.Components.Ide.Activation.LicenseSyncResult[] results, Boolean ignoreSyncErrors) [0x00264] in /Users/builder/data/lanes/2968/ac9b7fcb/source/md-addins/Xamarin.Ide/Xamarin.Components.Ide/Activation/ActivationService.cs:762
at Xamarin.Components.Ide.Activation.ActivationService+<GenerateFullWorkflowSequence>c__Iterator3.MoveNext() [0x00410] in /Users/builder/data/lanes/2968/ac9b7fcb/source/md-addins/Xamarin.Ide/Xamarin.Components.Ide/Activation/ActivationService.cs:654
at Xamarin.Components.Ide.Activation.ActivationDialog.DisplayWorkflowStep (Xamarin.Components.Ide.Activation.ActivationWorkflowStep step) [0x0002c] in /Users/builder/data/lanes/2968/ac9b7fcb/source/md-addins/Xamarin.Ide/Xamarin.Components.Ide/Activation/ActivationDialog.cs:463
at Xamarin.Components.Ide.Activation.ActivationDialog+<StartSpinnerTaskAndScheduleContinuation>c__AnonStorey4.<>m__0 (System.Threading.Tasks.Task t) [0x0005b] in /Users/builder/data/lanes/2968/ac9b7fcb/source/md-addins/Xamarin.Ide/Xamarin.Components.Ide/Activation/ActivationDialog.cs:561
PS: Уже есть версии версии 5.10.3 (сборка 26).
Для справки, вопрос также был задан еще 2 раза на переполнение стека: [здесь] (http://stackoverflow.com/questions/36385508/unable-to-activate-xamarin- unhanded-error-visual-studio-2015-update-2) и [здесь] (http://stackoverflow.com/q/36367833/2561894). –