http://www.divx.com/divx/player/knownissues.php
Some XVID content may play upside down in the DivX Player. This is due to a bug in the particular version of the XVID codec that is installed. The DivX Player includes its own RGB renderer, and these codecs send upside-down video data to the Player when RGB mode is used. Other players (e.g., WMP) may not show this problem, because those players do not use a native RGB renderer and instead convert YUV12 output to RGB.