I can see meeting participants, they can't see me (host)

[mark2918]

Audio is fine. Just started after the most recent update (5.15.3).  I have been a Zoom participant at Board Meetings for the past two years with no problem, however, I scheduled a meeting today and at first my participants couldn't see me, and then my video froze on their devices, and then they couldn't see me again.  I rebooted PC, did a speed check on my internet service - 325 Mbps download and 42 Mbps upload - about the same as it's always been.

Windows 10 laptop - no error codes noted