[mythtv-users] Black Screen when watchingTV

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Hi, 
I have a Wintv Nova-t Stick, that works perfectly in kaffeine.
I configured it in myth-tv and correctly dectected all channels.
But when I try to watch tv, I see black screen, except for OSD, that shows the channel's name right. I can change channel without problem, and the OSD works ok, but I still see a black screen.
Frontend and blackend logs show no errors.

any Ideas?