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Er..., since you mention '3 or more', does it show when there are two?

BTW: In the latest downloadable version (2.18) I have the same ../infusions/extended_profile/extended_profile_admin.php as on my Diptera.info website and it works perfectly well there, with all four fields displaying in 'Current Fields'.

Can you please both send me your MySQL and PHP versions (see PHP Info in Admin Panel -> System Admin).