I'm having an issue building a wall... I have a wall that is 5 blocks wide, so it's 7 including the corner blocks... There is one spot where no matter what type of blocks I use, when I go to put the next block in the the line, it destroys the block, block efore it and the block after it, and the block under it... I've tried everything, cobblestone, concrete upgraded concrete, rebar frames upgraded, metal trussing... Nothing survives... I've since shortened the length and built it over but that one spot refuses to cooperate...