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It sounds like you used to be using Acrobat and not Reader.
Acrobat can edit file properties (metadata). Reader can not.
This is correct or better I am using both but I didn't know that the one can and the other can't edit the metadata since both were always simultaneously installed. So thanks for the hint. I push that question in the correct place again.
Message was edited by: DragJo
One thing to keep in mind if you are using a Windows OS is that having both installed is not recommended nor supported. There are various reasons why (too many to list) but basically, if you have trouble with one or both, this more than likely will be the cause of it.
I just ran the Acrobat repair installation and I got the expected function back. In addition it does not matter any longer which icon I click (reader or acrobat) to open Acrobat. The reason for having both installed is just that I needed a "pdf viewer" from the first minute after having installed the OS and installing Acrobat needs much more configuration in my case then just the "tiny" Reader equivalent. The best thing: I did not realize any other problem.