Just here to say a ‘me too’…. although I’m not sure if it’s exactly the same problem.
After upgrading an older install to ACF Pro 5, I’ve realised I’m unable to add any new fields at all. I don’t have the old field groups in the interface anymore (they were exported to PHP and and are included in the theme), so I’m creating a brand new field group. That works fine, but any fields created within it do not save – on saving, the page just loads again with no fields.
I’ll probably get around this for now by writing it all in the PHP; I was just hoping to save myself a bit of time by create complex fields in the interface so I didn’t have to write them all manually.
Still interested in a fix if anyone has managed to solve this – if indeed this is the problem the OP was seeing!
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