I have no idea...
Works fine for me (and most others too, as it seems), so I'd say there is something wrong with your textures...
As I said on your site, a maze builder would be nice. Using the growing tree algorithm would be awesome. Just surround it with brick in a specific size and place it down with the block you want the maze made of, then power it with a redstone signal. Would be great for mapmakers.
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I'd like to see a "Living Bacteria" block, which, when activated via redstone (chains to all adjacent blocks) it will behave under the logic of Conway's Game of Life, but acting on a 3D plane, The Living Bacteria functions only in blocks similar to the one it is currently in, utilizing the blocks that an inactive Living bacteria is in contact with (excluding air) to determine what blocks to operate within, much like the destructive bacteria that we all know today, deleting whatever blocks it replaces, and deleting itself when appropriate.
Rules of the Game of Life
cells (represented here by blocks) have 2 states, living, or dead (existing, or not).
each cell's neighbors are found directly adjacent to it (x, y, and z at ~1, ~0, and ~-1 )
a living cell dies if it has less than 2 neighbors (1 or 0 neighbors)
a living cell dies if it has 4+ living neighbors
a living cell continues to the next generation if it has 2 or 3 living neighbors
a dead cell comes to life if it has exactly 3 living neighbors.
for the sake of the Living Bacteria blocks, it cannot create itself in an air block, so a cavern could kill a Living Bacteria glider, as there is no stone to create itself within. additionally, living bacteria will not transfer to variations of the same block, so smooth andesite will not transfer to smooth dacite, despite dacite holding the same block value as andesite, except having a different metadata