I think you might be right. When I tried earlier it was with an elevated account. Trying again with a basic user account I couldn't set rating or comment. Tried with a group permission and user permission.
Adding a comment with the rating worked for me. Thanks!
Have you had any luck when using the Recipe Links? I am able to add the link, but when I save the recipe it seems to freeze on "Saving recipe. Please wait..." and never actually adds the link.