If you use Open Street maps with the Germany tile server, you may get black ‘save your internet’ boxes as shown in screen grab. Just change to another tile server to get rid.
As you said: this most probably is a server issue, which might be gone in an hour, or tomorrow, or in one week. Don’t forget OpenStreetMap is a free service you use.
Definitely nothing to do with the Stack - looks like there’s a protest going on or something! Haven’t had time to check. All the other server options seemed to be fine.
This stack is a game saver with Google maps disappearing all over the place!
Yeah, they are protesting against the EU Upload Filter regulation, which will again be discussed on 12th of September.