I’m not sure when this bug first cropped up, but I’ve noticed while working with Ribbon particles lately that they don’t preview in the Wireframe view inside Cascade.
I’m using 4.4.1 (or whatever the latest public release is, my launcher says 4.4.0).
Try to change your background color to pure white as opposed to black and make sure your motion is checked on. Let me know if you still cannot see the ribbon after doing this.