Windows 7 - Dibcom 7700 DVB-T strange behaviour

Hi,

I have a Gigabyte GT-U8000 DVB-T dongle, which uses Dibcom 7700 chip. I installed its MCE codec, and Media Center can find all the channels and store them.

But when I try to watch them I only see a black screen. The channel name and current tv program are correctly shown.

Sometimes, opening Media Center, the last opened channel starts, I can see it perfecty, but when I switch to another channel, black screen. If I switch back to the cannel that worked before it keeps working. Only one channel works, the one that was selected when opening Media Center..

Using dongle included software I can see all the channels perfectly..

any idea?
Thanx