Thanks, I managed to see the error directly in the terminal: Connection error: login_region_mismatch. I usually use a VPN to connect to spotify, because I have the USA version even thought I'm in europe. Usually spotify says that my region doesn't match, directly in the application when the days are expired, but this time it decided to show me a black screen instead! By the way, the problem is now fixed, thanks. Hope it won't show a black screen the next time too!