I put a double wall down next to an open double box and now the wall is undeletable, and when I play the map in custom games the wall doesn't appear. Can anyone help?
This is just a glitch, so it should disappear if you save as new map, start a new round, turn off your console, etc. Just ignore it and return to the map again later and it should dissapear. I know no exact way to fix it, but it has happened to me before and somehow resolved itself.