Email Fails - SP2013

It seems to be a problem with the peoplepicker at runtime.  Only one user has this issue and it's me.  I'm a site admin.  It will work if I select use LoginName but fail when I select use DisplayName.

Forced due to logging gap, Original Level: Verbose] SearchFromGC name = {0}. start ...
[Forced due to logging gap, cached @ 04/30/2015 09:30:36.52, Original Level: Medium] ResolveAddressesForEmail : Resolved input '{0}' is not registered as the site collection user, ignored. Login '{1}', Email '{2}'
[Forced due to logging gap, Original Level: High] Exception occured in scope {0}. Exception={1}
[Forced due to logging gap, cached @ 04/30/2015 09:30:36.68, Original Level: High] Original error: Microsoft.SharePoint.SPException: The e-mail message cannot be sent. Make sure the e-mail has a valid recipient. ---> Microsoft.SharePoint.Client.ClientServiceException: The e-mail message cannot be sent. Make sure the e-mail has a valid recipient.     --- End of inner exception stack trace ---
    at Microsoft.SharePoint.Utilities.SPUtility.SendEmail_Client(EmailProperties properties)
    at Microsoft.SharePoint.ServerStub.Utilities.SPUtilityServerStub.InvokeStaticMethod(String methodName, ClientValueCollection xmlargs, ProxyContext proxyContext, Boolean& isVoid)
    at Microsoft.SharePoint.Client.ServerStub.InvokeStaticMethodWithMonitoredScope(String methodName, ClientValueCollection args, ProxyContext proxyContext, Boolean& isVoid)
    at Microsoft.SharePoint.Client.Rest.RestRequestProcessor.GetObjectFromPathRoot(Boolean mainRequestPath, EdmParserNode node, Boolean resourceEndpoint, MethodInformation& methodInfo)
    at Microsoft.SharePoint.Client.Rest.RestRequestProcessor.GetObjectFromPath(Boolean mainRequestPath, String path, String pathForErrorMessage)
    at Microsoft.SharePoint.Client.Rest.RestRequestProcessor.Process()
    at Microsoft.SharePoint.Client.Rest.RestRequestProcessor.ProcessRequest()
    at Microsoft.SharePoint.Client.Rest.RestService.ProcessQuery(Stream inputStream, IList`1 pendingDisposableContainer)
    
Others have no problems.  I seem setup correctly, no different than them.

Anyone else experience this issue?

Thanks.

Tom