Very damaging error in my opinion.
16% of people still use Internet Explorer and my subjective guess is that 99% of them don’t know how – or won’t want to – change their privacy settings to accept ALL cookies, simply to post a comment.
Which means I can’t use this feature as is, and I don’t see how anyone can. It doesn’t even give an error, it just hangs. Which means people will probably close the site and goodbye potential customer.
If it can’t be fixed, then provide a warning/error or disable the feature for IE users.
I will implement something for my own site, since I can’t just dismiss 16% of all people.