philljp.. it's a paradossal....
I've read this
http://www.projecthtpc.co.uk/troubleshooting.html , tired to play mkv file with Graphedit and, as Mediaplayer classic, vlc and windows media player... I can see the film perfectly.
Codec and filters seems like ok, but... playing it with mediaportal... allway black and white.
As I wrote before, if I change the video aspect ratio, using Microsoft remote control, with pan&scan and zoom... colours are true, but the video is "deformed" cause of the change of aspect ratio.
Now... I don't know what I have to do
I've installed last ffdshow, haali media splitter, last CoreAVC... but always the same problem.
EUREKA!!!!!
Updating my video card's driver... finally I can see my mkvs
