Now there are to many postings to quote but I want to thank all that are related to my issue.
As mentioned I started the 2.3.0 version from scratch without any downloaded saves.
Yes, I used the basic cheats that were mentioned in the Spoilerland Walkthrough when I found that. Though I doubt I used them from the beginning. Actually I have used them with the new start again.
But of course cheating could be my quest problem. So now I understand and can live with it.
Anyway, thanks again.
Restarting the game is actually not really a punishment.