I've been trying to build a self propelling device-i'm not copying anyone, i'm just testing things out-and the frame won't pull the diamond. Is this supposed to happen, or a bug?
The id is 1183987
Your PSTN has a ctype of DMND (press d to see ctypes), which means DMND is its stopper element, just change that to something else (or 0). You probably drew over the PSTN with a DMND brush, which sets ctype.