I remember this scipt and similar probs I was having but thanks to the 'Master' who made it all possible, I found the answer was in ensuring the terrain was not scaled at all and that the proper amount of vetices were calculated as described in the article if I made larger terrains (66 x 66, 99 x 99).

I even made a working test scenario demo out of it and put it up for others to draw examples from, I was so proud I had got it all right .
Now I use Georges code base exclusively as it works and the comments make it easy for me to gain insight and understanding though I am still a long way away from being a programmer.

Now days, I try to version control all my derivatives but sometimes I am in so much of a hurry that I forget but this should still be the way code is reused, with the proper credits given at the start of the code series and commented editing along every change made before making public, something we all need to keep in mind, myself especially.
Usefull examples can be found in Dougs Templates series where commenting and version control can be easily seen.

George is my inspiration, the programmer who got me into programming thru the wonderful AUM series and the kind help given even though the man was over worked and busy, busy, busy.

So please take the time to read the article carefully, you will find the solution then

Hope this helps in more ways than one...