One item to note; the first time it was shelled, I used the direction "normal", and that's what I tried to use again, earlier. I tried shelling using the "flip" direction and that mode worked on the object, see attached image. I'm just not clear as to why one method would work one day and the following it doesn't. Please note: I'm fully aware that this may 100% operator error, based on my limited (and still learning) knowledge of MoI. If this is the case, I want to understand what I'm doing wrong so I can work out my bugs with the way that I'm using and building it the application.