Witch king stuck at pelennor fields

[Rotcrafter]

i'm in the mission at Pelennor fields, and when I've gotten to the part with the witch king. he doesn't move. it seems like he's clipped out of his fellbeast (the dragon'ish thing). so he keeps running forward in the saddle, and the fellbeast doesn't move. I've tried reloading the mission but it just happens again

[markrevell]

Try setting your in-game framerate to 60fps, making sure your main graphics (NVidia, etc) aren't trying to override the game settings and push for something higher. Then set your Windows sound settings to 16Bit44100Hz (or as close as you can). The older Lego games don't like to be run at higher specs.
In addition if you're still having problems. My usual fix for Lego graphics glitches is to pause the game and change the Video/Effects to their lowest/off settings and switch off any Extras you have. You can do this just before you reach the problem area and back again once you're past. It tends to look awful but it works for most problems you encounter in the Lego games.

Hope this helps :)