I've been messing around with the terrain engine. It's a good thing too, as I've squashed a few big bugs and brought light to new ones.
One of the bugs was that it wouldn't be able to show terrains with more than 1000 or so polygons. No errors given, it would just stop. But now it is fixed and can support models up to 63368 polygons per ground id.
As another bug I've noticed is that it sometimes the left most side of the ground sometimes gets creased when loading heightmaps and it is very noticeable when smoothing.