Having had this same problem on select installations, I have found that you also need to have turned on:
Site administration > Advanced features > Enable comments (usecomments)
I hope this observation will speed others to a quicker solution.
Having had this same problem on select installations, I have found that you also need to have turned on:
Site administration > Advanced features > Enable comments (usecomments)
I hope this observation will speed others to a quicker solution.