If you are trying to Make Thread-Safe Calls to Windows Forms Controls then you can run into deadlock problems when calling 'Invoke' from your thread, if your main thread is waiting for a Thread.Join on the calling thread. I posted a workaround for this on the Microsoft site, which uses an extra thread to make the call to Invoke method, to avoid the deadlock. VB.NET example:
Private Sub SetText(ByVal str_text As String)
        If Me.textbox1.InvokeRequired = True Then
                'call an asyncronous invoke, by calling it then forcing a DoEvents
                Dim asyncInvokeThread As New Threading.Thread(New Threading.ParameterizedThreadStart(AddressOf AsyncInvoke))
                asyncInvokeThread.IsBackground = True

        End If
End Sub
Private Sub AsyncInvoke(ByVal obj_text As Object)
        Dim str_text As String = CStr(obj_text)
        Dim d As New SetTextCallback(AddressOf SetText)
        Me.Invoke(d, New Object() {str_message})
End Sub