fenza on "[Plugin: iThemes Security (formerly Better WP Security)] Gravity forms is not working with iTheme security"

Hello,

My gravity forms (1.8.4) is not working with iTheme security(last version)..
White screen after install gravity.
When I disable iTheme security.. everything work fine with gravity forms.

When enable iTheme.. the screen goes white and my wordpress menu stop working anymore..
Nothing happen. only white screen!

Thank you for your help in advance!

https://wordpress.org/plugins/better-wp-security/