Hi, I'm using raspbmc (currently at raspbmc-rls-1.0-hardfp-b20130208-u20140401). When watching a video (from a usb hdd, 720p, H264 - MPEG-4 AVC) the screen turns black during dark scenes, sound continues. This can take a split second up to minutes, and if I put the video on pauze, it does show the c...