I have unticked the boxes now, but am now wondering what would be the best way to reinstate my self-pings. Maybe I am misusing the technology, but I use self pings to link to and build upon past posts.
Today I discovered that all my self-pings had disappeared. On further investigation, I found that self pings on the same URL and domain had been ticked. I did not tick these, so assume that something might have happened in an update.