Using latest version of Xara Designer Pro X, the feathering effect is removed after slicing an object or group of objects. This doesn't happen in my previous version (version8).

To clarify: I create an object and apply the feathering effect to the object. I then draw a line through the object where I want it to be sliced/cropped. With both the line and the object selected I engage the "Slice (Cut) Shapes" command (Ctrl+4). The shape is successfully sliced but the feathering effect disappears.