Some readers were experiencing problems with posting comments. It is difficult for us to trace them, as they do not happen to all users. For instance, I do not have any problems even when posting comments as plain anonymous user. Googleing has not helped me to find out what the source of the problem may be. I have changed the options to post comments (pop-up window), but I am not sure whether this is the correct solution. If readers find this too cumbersome I will set the options back again to 'comment embedded below post'. Any help in this regard is of course welcome.