Ok, I can now reproduce the bug at will. First I create a new scene. Then I insert a terrain. Insert plant. Then finally insert surface replicator. At this point I can still change the interactive settings and they update. Even after I make the plant a child of the replicator. But as soon as I choose the terrain in the surface replicator I lose all interactive settings. Actually I can still use what I was using but I cant adjust them on the fly. Instead I have to set them where I want them, save the file and restart Carrara. I would be interested if anyone else can reproduce this bug. Thanks, Donnie