Placed a marble mason down in same spot about 20 times and each time it self deleted.

[Nutisbak]

As title says I've placed a marble mason in the same spot loads of times only to see it self delete time and time again. If I move it slightly to another spot it goes through fine, so I think it's a glitch in the game perhaps.

Anyway I'd give a grid reference but I don't know how and I'm about to hit the hay.

[marlock]

if you really want it in that spot try deleting the cache then try again