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Thanks a lot for your very complete answer. How/where can i "click on every single invalid data-defined override ?" Solution B worked.
– greg
Commented Feb 28 at 19:21
Invalid data defined overrides are the red squares you see in your label settings screenshots. You can click on them and a menu appears that includes the option to Clear the override (not sure what it's called in French but it should be the option right at the bottom of the list). Dont forget to click the "Paramètres" button in your second screenshot and clear the overrides there too.
– she_weeds
Commented Feb 28 at 23:30

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