I`m doing this in trs2006. I played around with it some more this morning, this time covering the entire grid. I put down 5 different textures each totally covering the grid, checked the dependencies list and all 5 were there. Then I added 3 more layers on top of that just to see how many it would save or how many would be deleted,checked the dependencies list and saw unexpected results. Only 5 layers but it deleted layers 2,3,and 4 not 1,2,3 as I expected. Then I went over the whole thing with the grid texture, this time it deleted all the layers except 1,7,8. I then noticed that I didnt have the grid texture size set to small so I went over it again with it set at small and this deleted layer 7 leaving me with layers 1,8, and the grid. I also ste up another new route to check on something ,placed 1 building on it so I could save it , and check the list. The grid texture is always on the dependencies list even if you haven`t painted with it. I also discovered that if you paint a spot with the grid and try the get texture tool it won`t get it. I`ll try the 8 layer thing again making sure the grid size is small to see if it does the same thing with the 7th layer. I don`t know if it counted the 2 different grid size layers as 1 or 2 layers.