Trouble on Switching (1 Viewer)

[realmatrix]

TV-Server Version: tvengine3 Rev17368
MediaPortal Version: MediaPortal 0.2.3.0 Rev17368
MediaPortal Skin: Default Blue Wide
Windows Version: Windows XP SP2
Motherboard Chipset: nForce
Video Card: Ati 2400pro HD
Video Card Driver: latest CCC
Sound Card: AC97
1. TV Card: Haupauge Nova SE
1. TV Card Type: DVB-S
1. TV Card Driver: Latest
Remote: iMon
TV: Toshiba REGZA 42" (FullHD)

If i try to turn of the TV mediaportal crashes down.
sometimes on Scanning channels on TVE3 tvservice.exe also crashes.

my somebody know an answer, or find the bug.

greets Michael