Problem: Silhouette registration marks not detected, causing registration failed error. Error reads: "Failed to detect Registration Marks. To retry, use [arrows] to position tool above the black square, then click REGISTER"Cause 1: Machine is confused where the registration mark box is.Cause 2: You are using glossy paper which are too reflective for Silhouette Print and Cut machines (Curio, Cameo and Portrait) to read. From our experience, Buttercrafts Glossy Printable Vinyls work well with Silhouette Print and Cut machines. So not an issue if you use our glossy printable vinyls.Solutions: Click here to read more