What could cause blocks to be not placeable in a very specific area?
I don't believe it's a case of trolling or griefing as we are very early on in our server. The problem area is where I had an auto-spawner set-up, so grinder, slaughterhouse, auto-spawner, pipes for power and mob essence. The best way to explain what is happening is that upon removing the blocks in this area, it appears as if the server believes there is a block in that place, but my client does not. So trying to place the block in the area allows it to appear for an instant, and then back in my inventory. Only this room has done this, but it's a very concentrated area, about a 6x 3 high x 6 area around where my auto-spawner used to be.