Hi @Elliot, sorry for the delayed reply.
Here’s the thing – I only have ACF as my plugin and Vaultpress. I’m really not a fan of having plugins unless it has a very helpful feature like ACF.
Featured Image Meta Box comes back whenever I disable ACF > <
Since I’m using Vaultpress, I have backups of every changes in my site and I basically restored my plugins back which makes my ACF version 3.xxx or something and voila – Featured Image is back in older versions of ACF.
Installed 4.3 again and it hides the Featured Image metabox again.
Not really sure if it’s me who has the problem > <
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