[@mercime Participant 14 years, 6 months ago]

@creaturis From recent WPorg forum post – https://wordpress.org/support/topic/cant-post-big-post?replies=7

From old post but valid in some installs – http://www.undermyhat.org/blog/2009/07/sudden-empty-blank-page-for-large-posts-with-wordpress/

For more assistance, please post at the WP Forums – How to and troubleshooting