wp_insert_post and tax_input problems

I am grabbing my Dribbble posts by RSS and inserting them as posts with wp_insert_post. This is working great except that rather than create a custom post type, i decided to add them as posts and use a custom taxonomy named “format” to distinguish them from other types of posts. Here’s where my problem comes in. ‘tax_input’ works okay from the taxonomy ‘category’, but it ignores my custom taxonomy. Here’s my code:

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