This is very weird, I re-added the http:// prefix in front of the link in the
link list file and now it works. Did nothing else. Sounds like a bug?
OK made a second test, removed the http:// from the link.
www.domain.com!=primary error.

OK made a third test, re-added it. Works with no problems.

The only thing I cannot explain is why the previous project in another
directory works permanently without the http:// prefixes! Very unpredictable
behavior.