Beveling in SubD object not working

I’m following the video here, but when I try to apply the bevel, it just snaps back to the original position.

Video

Any help appreciated.

I changed your title. This is about a SubD, not Nurbs.

Not sure what your problem is.

Maybe post the file?

Nevermind. Started a new file, working as expected.

I suppose posting a question here fixed it.