hmmm... All I could see was the tail (Horrible download internet meant I couldn't get far into the video) And I had a case where the tail was always a different colour because I had deleted the textures.
How did you download it? did you use the normal dowenload or the torrent? I would suggest uninstalling and deleting EVERYTHING. Then download it again, preferably torrent, the torrent needs a program to run, I suggest utorrent, and reinstall. The torrent doesn't get as many issues as the normal download.