… this is new for me … since a few days I get an error from time to time with message shown in the subject. Just the error message and a link to “Learn more about debugging in WordPress”. The post I tried to create in this moment is actually there but is obviously not “counted”. The message list does not indicate a new reply.
And another weird behaviour appeared when I visited Powershell.org with another browser with incognito mode without beeing logged in. This way I saw a complete different list of forum messages … somehow from a few hours before.