Are you using the built-in ffmpeg codecs, or the Microsoft codecs? (right-click on the Moonlight control to get the install option). If the former, try the latter. If it doesn't crash with the MS codecs, it's an FFmpeg bug.
Are you using the built-in ffmpeg codecs, or the Microsoft codecs? (right-click on the Moonlight control to get the install option). If the former, try the latter. If it doesn't crash with the MS codecs, it's an FFmpeg bug.