block_admin_display_form_submit not getting called
I'm having the same issue, I cannot call function block_admin_display_form_submit($form, &amp;$form_state).

I've set a custom variable that should be updated if I change block region.

Everything works if I do it from the block edit page(admin/structure/block/manage/menu_block/ID/configure), but if I try to do it in the block admin display form (admin/structure/block), It will not work.

I've tried to increase max_input_vars with no success.

Have you solved it?