I have been looking for a fix for this for hours, but I have found nothing.

www (dot) darkcreations (dot) org/forums/topic/6737-terrain-raisinglowering-issue/

CCNA Here is the link for you

http://www.darkcreations.org/forums/topic/6737-terrain-raisinglowering-issue/

Do any of these help you?

https://www.youtube.com/watch?v=0g87PaahBEw

https://www.youtube.com/watch?v=ys-FcWzJl5s