Some participants (students) have been noticing that occasionally when a host (teacher) shares their screen, instead of seeing the shared content, they see a black screen. This appears to happen randomly and sporadically. The gurus at Zoom have suggested that hosts change this setting in their Zoom app (NOTE: this is for Windows and Mac only, version 5.4 of the Zoom App is required):
Go to Zoom Settings>Share Screen>Advanced> Enable “Use TCP connection for screen sharing”.– Zoom Support (10/27/2020)
Did this work for you? Comment below to let me know!