OK I wasn’t able to reproduce that on Safari/mac doing the same thing on a test install, (it did not prompt for a database upgrade again though I didn’t deactivate ACF 4 plugins while updating to 5.0.4 so maybe order of deactivation does not matter). I was doing it before with Chrome/Win7
In any case, when I deactivate ACF 5 Pro and reactivate ACF 4, and then go back to ACF 5 Pro, I get prompted to upgrade the database again, and each time I perform the upgrade I get another copy of the field groups.
Any thoughts appreciated. I’m thinking if I cannot rollback the database I can just delete the new duplicate fields (the ones with higher post ID) since I have not resaved any post/page that uses them.
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