Beta 570, Application.Current.Dispatcher.Invoke freeze DB, why?

[taozi]

Before beta 570, my plugin ItemCount worked smoothly, after I updated DB to Beta 570, it stopped working, freezed DB with last message as:

INFO  Logger [Trinity 2.13.38] Waiting for Navigation Server...

it seems my following code:

 Application.Current.Dispatcher.Invoke(() =>
            {
                boxText0.Text = "Counting... Please wait...";
            });

freezes DB, this code basically do a UI update from other threads, can somebody tell me what I should do to fix this?