Hey. Me and other people have got the same problem. Also in the US people are reporting it. Check out my thread here: https://eu.forums.blizzard.com/en/wow/t/unable-to-open-wow-black-screen-and-an-infinite-mouse-loader-followed-by-unresponsive-error
Tried talking to customer support but I’ve received the “Why don’t you try to update your drivers” response.