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If it still doesn't work, maybe there is some kind of conflict with other plugins: feel free [to write in the forum](https://wordpress.org/support/plugin/duplicate-post) and we'll try to discover a solution (it will be *really* helpful if you try to deactivate all your other plugins one by one to see which one conflicts with mine... But do it only if you know what you're doing, I will not be responsible of any problem you may experience).