I frequently have trouble with the cut path tool not working unless I fidget with the line I want to apply that tool on. It can be quite annoying, especially when I am using attachments and locking red vertex points to board edges so I can create a curved cut off. This particular project is really taxing my patience because I have the right side of this project 9 ( separate file ) with the exact same cut path and it worked fine.
Would someone be kind enough to open this MPC with a newer version of Designer and let me know if you have any issues with applying a cut path ( hide cut-out ) to Line 2.. thanks