Thanks a lot man !
I used VMR9 and now I switched to ProgDVB rederer, it seems to work like a charm !

I've installed a nova-t-500. I had to enter the PMTs manualy because I had no image.
I have a correct image only after switching channel. Once the osd indicating the channel and the epg disapears, image becomes dark red or dark blue.
I couldn't find any issue on this subject on the forum. Tried ...