Sorry – one more update.
If I select a field type “Page Link” it also returns an empty select – so I’m guessing that something in the content ( title ) of one of the pages is throwing ACF out – but that would not explain why I can view pages on other screens – such as New Page?
Also – if I select a “Post Object” field type – but do not filter the results by post type – instead select “All” – no pages appear in the select options on the New Page screen ( it lists all other posts in all other post_types ) – they do however appear in all other screens.
