I am wondering if this is an artifact of using children of all the base classes. In this case you can see I am using Tile Game Mode which is a child of BP Grid Manager Game Mode. I am also using Tile Grid Manager which is a child of BP Grid Manager. However I am using the Ref to BP Grid Manager to get to the edge array. The part that is troubling to me is that it seems ok with using the grid size x and grid size y from the same ref and that works correctly so it should not be a case where I have not accessed the correct variable. I did try setting all of the tile edges to 0 for all tiles on begin play in the Tile Grid Manager and that does work but activating a tile does not change it’s values back to 1. Anyway eyes are crossing I am calling it a night will try some more things tomorrow.