I have an old D6 site. I created a form with hook_form with very many fields (197 rows * 6 columns = 1182 fields). It works good and form submit works properly.
But when I add a new, 7th column to the form and the fields number becomes 1379 the form submit is not firing.
I do not see any errors or warnings, php memoty limit is set to 256M and post max size too. But submit handler simple does not fire.
What can be a cause?