I just installed XBMC on my Raspberry Pi model B. When i start a movie to play you can hear the sound but the screen is black. It is a .VOB file that comes from a DVD. Anybody knows what's the problem?
Now I'm no expert by any means, but a black screen tells me you're probably missing an MPEG-2 codec, which can be purchased from http://www.raspberrypi.com/mpeg-2-license-key/. You may have to follow some other steps, but as I do not yet have a board, I cannot recommend any guides at this time. Either way, you need the license.