I recently had an issue with encountering a black screen and a black “X” cursor with Chrome Remote Desktop on Ubuntu 20.1
A few searches led me to a stack overflow entry from 2014. However, I’m lazy so I figured I’d start simple.
Using the commands below to stop and start the service fixed my issue.
user@server:$ /opt/google/chrome-remote-desktop/chrome-remote-desktop --stop
user@server:$ /opt/google/chrome-remote-desktop/chrome-remote-desktop --start
I have since encountered this issue a few times. Having a smaller browser window also seems to help avoid the issue.