Can you provide some more screenshots, from a birds-eye view angle?
It's possible your client is missing the necessary texture file needed to display the missing texture, open up 70.wld in ShStudio and check what textures it's using, which should be:
- R2_FireZone_Rock
- R2_ground03
- R2_Grass02
- R2_Ground02
- R2_Grass
- R2_Ground
- R2_FireZone_Ground
- R2_Waterzone_Rock
If these are correct, browse into; Terrain > Detail. Check all the corresponding files are in there. If not, simply import them. If they are all there, open them up to make sure they're displayed correctly.