Safari 12: URLs do not resolve
I updated to Safari 12. When I enter a URL into the search field, Safari stays blank, doesn't return a website, doesn't resolve the URL. This is true for some URLs, not all. For example, digg.com and unitymedia.de the browser simply will not display, even though unitymedia.de is in the browser history.
After typing and hitting return, the search field turns blank and grey and after a few seconds it simply reloads the webpage that has already been in the tab. When the tab is blank, the search field turns blank and grey and after a few seconds returns a basso sound and that's it.
What's this about?
Mac mini, macOS High Sierra (10.13), Late 2012, MacMini6,1