There is no such function here, so it must be some kind of bug.
Can you explain more about the problem?
Can you see comments when you're logged out?
What do you see when you're logged in? Do you see the "Add new comment" bar / button at all?
Can you try a different browser?
If it works in a different browser, can you tell us which browser is not working?
How long has the issue been in effect?
Is anyone else having the same issue?
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