When writing a posting and clearing the browser information (cookies, cache, login information, etc.) I will be directed to a 404 error message when re-logging in to post another message. Fact is, however, that I was correctly logged in despite the error page showing up (as evident when going back to the previous page from which I logged in and reloading that page).
So, somehow the website responds malfunctionally.

Michael.

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President of Rechenkraft.net, Principal Investigator of the RNA World distributed supercomputer.