Screen sharing failing to refresh viewers

[DavinChurch]

Whenever I am in a group meeting and I share my screen, everyone else cannot see any changes I am making to my screen. Nobody else has these problems and I cannot find any way to get around the problem. If I stop sharing and restart, or if I issue a Zoom command (including just switching the "sharing" status bar between top and bottom), everyone gets refreshed, but I cannot continuously do that with every word I type.

I am using the latest PC app but it also occurs if I stay on the browser. It happens whether I am sharing the application window or my whole screen. It happens with any application, including OS windows like Explorer.

However, I cannot ask for official support for this because I am still using Windows 8.1 and cannot change. (But this has been happening for years, even when 8.1 was still supported, and I am now needing this feature more than ever.) I have three monitors and am sharing only one of them. I have changed my "Share Screen" settings to include "Share all windows from an application", but it has the same problem with or without that setting.

What other information can I provide that might seem to be pertinent?

Does anyone have any ideas of something I might try?