Hm, when I try this I always get:
2010-11-02 00:47:40.433711 [ERROR][MPMain(10)]: Exception ystem.InvalidCastException: Unable to cast object of type 'MediaPortal.Dialogs.GUIDialogNotify' to type 'MediaPortal.Dialogs.GUIDialogNotifyLastFM'.
at MediaPortal.GUI.Music.GUIMusicPlayingNow.doLastFMLove() in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\WindowPlugins\GUIMusic\GUIMusicPlayingNow.cs:line 2302
at MediaPortal.GUI.Music.GUIMusicPlayingNow.OnAction(Action action) in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\WindowPlugins\GUIMusic\GUIMusicPlayingNow.cs:line 508
at MediaPortal.GUI.Library.GUIWindowManager.OnAction(Action action) in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\Core\guilib\GUIWindowManager.cs:line 457
at MediaPortalApp.OnAction(Action action) in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\xbmc\MediaPortal.cs:line 2759
2010-11-02 00:47:40.433711 [ERROR][MPMain(10)]: Exception :Unable to cast object of type 'MediaPortal.Dialogs.GUIDialogNotify' to type 'MediaPortal.Dialogs.GUIDialogNotifyLastFM'.
2010-11-02 00:47:40.434711 [ERROR][MPMain(10)]: site :Void doLastFMLove()
2010-11-02 00:47:40.435711 [ERROR][MPMain(10)]: source :WindowPlugins
2010-11-02 00:47:40.436711 [ERROR][MPMain(10)]: stacktrace: at MediaPortal.GUI.Music.GUIMusicPlayingNow.doLastFMLove() in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\WindowPlugins\GUIMusic\GUIMusicPlayingNow.cs:line 2302
at MediaPortal.GUI.Music.GUIMusicPlayingNow.OnAction(Action action) in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\WindowPlugins\GUIMusic\GUIMusicPlayingNow.cs:line 508
at MediaPortal.GUI.Library.GUIWindowManager.OnAction(Action action) in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\Core\guilib\GUIWindowManager.cs:line 457
at MediaPortalApp.OnAction(Action action) in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\xbmc\MediaPortal.cs:line 2759
2010-11-02 00:47:40.437711 [ERROR][MPMain(10)]: exception: Unable to cast object of type 'MediaPortal.Dialogs.GUIDialogNotify' to type 'MediaPortal.Dialogs.GUIDialogNotifyLastFM'. WindowPlugins at MediaPortal.GUI.Music.GUIMusicPlayingNow.doLastFMLove() in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\WindowPlugins\GUIMusic\GUIMusicPlayingNow.cs:line 2302
at MediaPortal.GUI.Music.GUIMusicPlayingNow.OnAction(Action action) in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\WindowPlugins\GUIMusic\GUIMusicPlayingNow.cs:line 508
at MediaPortal.GUI.Library.GUIWindowManager.OnAction(Action action) in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\Core\guilib\GUIWindowManager.cs:line 457
at MediaPortalApp.OnAction(Action action) in C:\Users\DieBagger\Documents\Work\Projects\Desktop\MediaPortal\MediaPortal1\Clean\mediaportal\xbmc\MediaPortal.cs:line 2759