UPS Tracking not available

Everytime I try and track one of my orders I get an error message screen

Value cannot be null.
Parametername: g


bei System.Guid..ctor(String g)
bei main_user_account_ParcelTrackingDetails.Page_Load(Object sender, EventArgs e) in d:\www\sip20\html\main\user\account\ParcelTrackingDetails.ascx.cs:Zeile 36.
bei System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
bei System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
bei System.Web.UI.Control.OnLoad(EventArgs e)
bei System.Web.UI.Control.LoadRecursive()
bei System.Web.UI.Control.LoadRecursive()
bei System.Web.UI.Control.LoadRecursive()
bei System.Web.UI.Control.LoadRecursive()
bei System.Web.UI.Control.LoadRecursive()
bei System.Web.UI.Control.LoadRecursive()
bei System.Web.UI.Control.LoadRecursive()
bei System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

 

Just thought you might like to know there seems to be an issue with the UPS API

I've been trying to report the same issue multiple times but no fix, no reply, nothing...