Teletext blinks and disapears (1 Viewer)

[peaksie]

TV-Server Version:
MediaPortal Version: 0.2.3.0
MediaPortal Skin: BlueTwo
Windows Version: Windows XP SP2
CPU Type: AMD 3200+
HDD: Seagate 200GB
Memory: 2048 MB
Motherboard: MSI K8N Neo2-F
Motherboard Chipset: nVIDIA® nForce3 Ultra Chipset
Motherboard Bios:
Video Card: ASUS GeForce 7600GS
Video Card Driver: Forceware 91.46
Sound Card: Realtek AC97
Sound Card AC3:
Sound Card Driver:
1. TV Card: Digitaleverywhere FireDTV-T
1. TV Card Type:
1. TV Card Driver: BDA 4.8.0
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: Nvidia Video Decoder
MPEG2 Audio Codec:
Satelite/CableTV Provider:
HTPC Case: Silverstone
Cooling: Artic Cooling
Power Supply: Silverstone 420W
Remote: Microsoft
TV: LG 42" Plasma
TV - HTPC Connection: HDMI Supra

When i try to view teletext you can see that in blinks for half a second and the disapears.

From error.log:
2007-09-26 19:31:45.062500 [ERROR][11]: Exception ystem.NullReferenceException: Object reference not set to an instance of an object.
at MediaPortal.GUI.TV.GUITVFullscreenTeletext.Render(Single timePassed)
at MediaPortal.GUI.Library.GUIWindowManager.Render(Single timePassed)
at MediaPortal.GUI.Library.GUILayerRenderer.RenderLayer(Single timePassed)
at MediaPortal.GUI.Library.GUILayerManager.Render(Single timePassed)
at MediaPortalApp.RenderFrame(Single timePassed)
2007-09-26 19:31:45.062500 [ERROR][11]: Exception :Object reference not set to an instance of an object.
2007-09-26 19:31:45.062500 [ERROR][11]: site :Void Render(Single)
2007-09-26 19:31:45.062500 [ERROR][11]: source :WindowPlugins
2007-09-26 19:31:45.062500 [ERROR][11]: stacktrace: at MediaPortal.GUI.TV.GUITVFullscreenTeletext.Render(Single timePassed)
at MediaPortal.GUI.Library.GUIWindowManager.Render(Single timePassed)
at MediaPortal.GUI.Library.GUILayerRenderer.RenderLayer(Single timePassed)
at MediaPortal.GUI.Library.GUILayerManager.Render(Single timePassed)
at MediaPortalApp.RenderFrame(Single timePassed)
2007-09-26 19:31:45.062500 [ERROR][11]: RenderFrame exception Object reference not set to an instance of an object. WindowPlugins at MediaPortal.GUI.TV.GUITVFullscreenTeletext.Render(Single timePassed)
at MediaPortal.GUI.Library.GUIWindowManager.Render(Single timePassed)
at MediaPortal.GUI.Library.GUILayerRenderer.RenderLayer(Single timePassed)
at MediaPortal.GUI.Library.GUILayerManager.Render(Single timePassed)
at MediaPortalApp.RenderFrame(Single timePassed)