Is this a bug? The same tile in many different states
See how these are all the same tile, yet some look different from the others? It's my understanding that this shouldn't be possible. I only have one layer visible. I got in this state by using the marque tool and selecting across multiple tiles, then hitting the delete key.
My intention was to remove certain tiles from the canvas (I realize now that's not the right way to do it). But, now I'm not sure how to do that. What's the best way to remove tiles from the canvas? I've been creating a new blank tile by hitting the plus button in "Tiles" dialog, then placing that on top of the tiles I want to clear.