Let me know if you got it straight or not. After playing a bit, I am understanding the replicator better. So basically, insert a terrain, then assign the replicator, then use mesh instead of bounding box to view the grid, for placing things on it. I would avoid having to insert another terrain, I would try to hide the original terrain, if that helps. I also would avoid moving the original terrain around or adjusting grid thickness etc...(even tho I mentioned that initially) Also use autogrid. My issue today I think was due to not having 0's in all the random transforms when using autogrid. Haven't spent anytime checking this out. This was good to pursue tho because i hadn't really started using the replicator much especially for terrains, so now after spending a little time with it I am using it in some other mad experiments. :biggrin:

No need to think outside the box....
    Just make it invisible.