QuiltnNan and for those that mentioned with the Shape-Cut you find the slot moving during cutting.
I believe I learned this handy tip here on the boards but it sure does help me so I will pass it along.
If I take my long Creative Grids ruler or any long acrylic ruler and put it on top of the Shape-Cut along side the cutting slot of the Sharp-Cut, it holds the fabric and Shape-Cut more solidly. I hope that I explained this so you can understand. It really helped me as I too had problems with the Shape-Cut from time-to-time with the slot moving.