Actually, I think you may be right.  I just rechecked to make sure the box was ticked, applied a mat and added some trees for an ecosystem, populated.   Then loaded a new terrain but it loaded with the default creamy white.    Clicked back to the original terrain and then loaded another andstill just the default.

But how can it be a bug if it's only happening in MY Vue ??

My brain cell is hurting now.

Gill