I have used this feature before on a different child page (lets call it page 2) of the same parent and it works. But on my particular page it doesn't (lets call this one page 1). I checked my profile settings and of course, it all set right. (Show option is selected)
On page 2 - i am able to create comments inside a macro, inside a table and external text.
On page 1 - Cannot add a comment on anything