No, it's not no modify. I'm using the MILA shape that came with my skin and I've been modifying it to my liking since I got it but for some reason it doesn't work anymore. I literally just changed my shape maybe 3 days ago and now it doesn't work at all.
As you can see, every time I try to click on a part of my body to edit, the sliders do not open. I've even tried to start as a default avatar but my sliders still didn't work. Any ideas?