I’m afraid that once again this blog is receiving a torrent of hundreds of attempts to post comment spam each day.
To address this, as a temporary measure, I am blocking the posting of comments to any articles that are more than 40 days old. Please feel free to post comments as usual on more recent articles, though.
I will review this in a couple of days, and then hope to be able to allow unrestricted comments again.
My sincere apologies.
I have now returned settings to normal, which should allow you to comment freely again.