Okay thanks
Unfortunately I lost my docks, so I cannot verify, but I assume it's good now.
I also used "reset the content of my docks" as of the arrow in your screenshot. That was mistaken.
I replaced the new settings with my backup setting files in the folder, rebooted, but I thought the docks were restored too.
Well, they were there for many years..

PS: I used to drag folders into the quick launch dock, but it doesn't work.
I can just add shortcuts or docklet's but not drag and drop a folder (this has been appeared before but now that I have to restore it manually I get in trouble.)
What's the trick?
PS 2: another issue is when I want to change an icon, the folder with my icons opens, but no icon is showed in any of the icon folders (the files actually reside there thou)
Also when I want to set the quick launch dock to auto hide, it says it would not be available on a second monitor (which I have).
I never saw this before since decades. (Also not with version 3)
Should I go back to version 2 ?
Or what would be the disadvantage to go back?
Thanks again