I keep having this problem where I finish editing my video, with everything lined up the way I want, and then after rendering the video and watching in windows media player at least 8 scenes have a moment where it where it turns the video black and almost inverted colours for a second. It only occurs right when cutting from one clip to the next. But it just starts to make the whole thing look very choppy and poorly done.

Does anyone know what could be causing this to happen?