VS 2013 can no longer sign in

Question

I had VS 2013 (upgrade to update 4) installed for some time and logged into my MSDN account. A week or so ago, when I went to publish a site to Azure, it started prompting me to login again. It had an error, but unfortunately I didn't note down what it was.
When I closed out of that screen I was logged off. When I tried logging in again the login window just says "Sorry, we ran into a problem" and "Exception has been thrown by the target of an invocation."
Log of the issue:
User:IdeUser, Exception has been thrown by the target of an invocation.: TargetInvocationException [inner: Method not found: 'Void Newtonsoft.Json.Serialization.DefaultContractResolver.set_IgnoreSerializableAttribute(Boolean)'] during ExplicitSignIn
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Activator.CreateInstance(Type type, Object[] args)
at Microsoft.VisualStudio.Services.Client.VssConnection.GetClientInstance(Type managedType)
at Microsoft.VisualStudio.Services.Client.VssConnection.GetClientServiceImpl(Type requestedType, Func`2 getInstance)
at Microsoft.VisualStudio.Services.Client.VssConnection.GetClientServiceImpl[T](Func`2 getInstance)
at Microsoft.VisualStudio.Services.Client.VssConnection.GetClient[T]()
at Microsoft.VisualStudio.Services.Client.VssServerDataProvider..ctor(VssConnection server, String fullyQualifiedUrl)
at Microsoft.VisualStudio.Services.Client.VssConnection.EnsureProviderConnected()
at Microsoft.VisualStudio.Services.Client.VssConnection.ConnectAsync(VssConnectMode connectMode, IDictionary`2 parameters, CancellationToken cancellationToken)
at Microsoft.VisualStudio.Shell.Connected.ConnectedUser.VssConnectionWrapper.ConnectAsync(VssConnectMode connectMode, String user, CancellationToken cancellationToken)
at Microsoft.VisualStudio.Shell.Connected.ConnectedUser.IdeConnector.<ConnectAsync>d__1.MoveNext() (ActivityId: 00000000-0000-0000-0000-000000000000)
I tried repair installing, uninstalling and then installing VS 2013 w/ Update 4 already integrated, but continue to get this error. Any ideas?

Answer 1

Hi Doug,
Maybe you could upload your log to the One drive, and then share us the link here, I will download and view it in my side.
>>I downloaded a new copy of the ISO from MSDN to reinstall in case that was part of the issue, but unfortunately it didn't solve it.
Please check the ISO Files SHA-1 Values.
http://www.visualstudio.com/en-us/downloads/visual-studio-2013-iso-sha1-vs.aspx
Maybe you could re-install it with the web browser, check it again.
Just to make this issue clearly, could you log-in it before with this account? Could you discuss this issue with other members? For example, use a new account to log in it again. Check the result.
(1)Run the command line:
'devenv /resetuserdata', test it again. 
(2)Please deleting the registry key under
hkey_current_user\software\Microsoft\VSCommon\12.0\clientservices\tokenstorge\visualstudio\ideuser
Re-open your VS, sign-in it again.
Best Regards,
Jack
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