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I have this same thing happening. One day screen sharing was working and the next day it wasn't. I press the "Resume Share" button and nothing happens. My job requires me to share my screen. I've updated Zoom. Check for any changed settings (nothing has changed that I can see). So frustrating.
under the checked shield is says: "you are using enhanced encryption" I don't know what enhanced encryption I would be using. I haven't changed anything.
A couple of things:
1. I had the same issue. Pressing "Resume Share" had no effect. However, I was able to share my desktop. If you're doing a Powerpoint and you're in presentation mode, there's not any difference between sharing directly from Powerpoint or sharing from your desktop.
2. I went into my Zoom Preferences and under "Share Screen" there was an option to "Share all windows from an application" and I selected that. That seemed to take the problem away. I'm using Softmaker's presentation software and I think that, for the presentation, it creates a separate window from the original application and this is what Zoom was reacting to. Once I enabled sharing all the windows from an application, I could just go right to the program and start the presentation with no issues.