I used to have Shutter working fine, but now I get this message. Looking on the Internet, I can't find a working solution. An ideas?
It means you are using Wayland compositor. When you login, and after you select your user name, a cog appears lower right. Make sure you select Zorin on xorg.
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For reference, this is the login screen that @swarfendor437 mentions where you can switch between X11 and Wayland:
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Sorry, I don't know how this happened. I've reinstalled several times and thought I'd always set this after the first time it came up