If I create a gallery field from the ACF plugin within wordpress, everything works fine. If I then use the ACF export to export the fields PHP code the field will not save. The metabox shows up ok and I can then select the items I want in the gallery and they show in the create/edit post page properly. Once I hit “update” on the post the gallery field loses the selected posts. Once again, it only is happening for a gallery field that is created using
if(function_exists("register_field_group"))
{
register_field_group(array (
'id' => 'acf_gallery',
…
Found out my problem a few min after posting. Forgot that I was removing the field key when in the PHP creation of the field. Added that in and it worked ok.