Hi, I don’t know if you ever figured out the answer to your question, but the problem is probably that you are using “=>” instead of “=” for your array.
In other words, instead of what you are using in your second example above, you should have this instead:
if (class_exists('MultiPostThumbnails')) {
new MultiPostThumbnails(
array(
'label' => 'Thumbnail Image (240x200)',
'id' => 'thumbnail-image',
'post_type' = array( 'culture', 'food', 'film', 'music', 'art', 'fashion', 'photography' )
)
);
}