Several people have said they are unable to leave comments. All the settings I have control over are set to let anyone leave a comment. Some user forums have indicated that it might be in reader's cookie settings.
I have jumped through the hoops available to me but I don't think you should have to do anything special to make a comment. I would love to hear from you though, so if you have something to say, please send me an email at jgrinmo at gmail dot com.
Thanks for reading