Last week I made some changes to this site to prevent spammers from harvesting e-mail addresses from this site and from posting spammy comments.
Unfortunately I made some mistakes, which made that visitors posting comments last week were automatically blocked from my site.
Last Thursday I fixed that problem, but also accidently introduced a new problem, so that comment posters received a 404 error.
As far as I know now, all issues have been solved, so go ahead and type your comments!