Oscape has difficulties generating LODs for the 0,0 cell, it's an old bug. To make it do its thing right, create a Region (obviously, your worldspace doesn't have one). Any Region will do, but it's a good trick to create a Border Region (square form, covers exactly your WS vertices: say, -16;-16 to 15;15 — 32x32 cells). Thus, you could generate landscape LOD in Oscape and trees/objects/extra landscape LOD in CK, and all of those will connect fine with each other. I see you used xLODGen. Posted this just for the sake of knowledge, so that others could look it up.