I downloaded and ran MediaPlayerClassic 18.104.22.168 on to an XP system and was happy with all the features but then suddenly the slow motion feature stopped working. Clicking the Decrease Speed icon shows the value in () dropping to 1/2X and then 1/4X but the frame rate stays at the full speed rate of about 29 fps, and even seems to speed up to 30-32 fps. I've uninstalled and reinstalled MPC but the behavior is the same. It's as if MPC has set something in some system module that prevents slow motion playback. Slow motion still works on another computer running the same version of MPC, and slow motion works on this computer with other video players.
Thanks for any suggestions.