Can't see shared screen on browser (laptop)

I use Zoom for meetings and lectures via browser on my laptop  (Windows 10) . Something has changed since December because I can no longer see the screen other people are sharing. I can hear the sound if it's a video but otherwise it's just a black screen. I've tried resetting Zoom settings,  restarting the computer and different browsers (Chrome, Edge) but nothing seems to work. I don't know what to do.