New Post: Getting COMExcpetion when attempting to register changes in a Windows 8.1 PC

I've create a task using this library, that worked.

Now when I use the TaskEdit dialog in the following way:

Using D As New TaskEditDialog()
    Using Tsk As Task = ts.GetTask("\MyTasks\Task1")
        D.Editable = True
        D.RegisterTaskOnAccept = True
        D.Initialize(Tsk)
    End Using
End Using

I get a COMException with __error code -2147216615 __and a message of (45,8):Period:. I have noticed that if I change the Configure For dropdown to Windows 7, Windows Server 2008 R2 it saves.

What am I doing wrong or does this library not support Windows 8.1 as yet?