Over the last few days the posts in this Blog were displayed in the wrong order. As a result an article from 2006 appeared on the front page. This was apparently caused by a incompatibility between version 2.0.11 of the blogging software WordPress and version 5.0.51 of the MySQL database which I installed recently.
Because I couldn’t find the incorrect SQL statement which caused the problem I decided to upgrade WordPress. And the good news is that that version 2.3.1 fixed the problem.