Sorry. I have made the following:
Uninstalled the Version 2.25.1025 and reinstalled the Version 2.22.968. Result: I am able to clean in the registry "HKEY_Load-Machine Software\...\,,,\,,,\App Management\ARPCache ...
It appears to me that something has changed in the newest version or a mistake is existing in the program.
Anythere. Wait and see is probabely the right way. Or do you have a better idea?
Thanks again for your assistance.
Spatz