good day,
when I click "edit tags" any variable, popup of edit tags doesn't come as this:
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You might, at least, mention the Ignition version and Designer version. Post a neatly cropped screengrab of the Help | About window.
What happens if you double-click a tag?
Even if I right-clicked and clicked 'edit tags' or double-clicked, an empty window appeared until I closed and then opened the designer.
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You need to quote the version (not "latest version") to be sure and to help anyone in the future. The current release version is ignition-8.1.38.