Heightmap Missing from Unreal TerrainEdit (RS2 SDK)

Hi, apologies if this is in the wrong area.

Basically, got the SDK for RS2 a couple day ago form the Steam Tools and having some issues witht he TerrainEdit.
In short the HeightMap isnt showing nor are any of the layers and the box they should be in is just blank. (see pic)
I can place the first material seemingly normally but adding any other layers either dont come up on the terrain or come up in large squares as a new layer per click.

I have tried uninstalling it and re installing it and nothings changed. I tried to re cache the terrain did nothing and the problem is there whether its a fresh terrain, a copied terrain or someone elses map.

Any help in this would be huely appreciated as its completely stalled my progress!
Thanks a lot in advance