Having tested the current and previous version on Mac, I have noticed that the Viewer tends to crash pretty often Catalina 10.14.4. To log back again I noticed I need to do it in three steps: On the first attempt I will log in, but the Host's screen won't show. I will need to close the Viwer window. On the second attempt, the Wheel of Death will eventually disappear, but there would be no connection with the screen again. In the third one, it will work.
This is the pattern I've been experiencing since the installation of the new release.