Hello,
also to me the Contact Form 7 module goes into error when the plugin is active. Below the php error log:
PHP Fatal error: Uncaught Error: Class 'MailPoet\Models\Segment' not found in /home/xxxxx/public_html/wp-content/plugins/add-on-contact-form-7-mailpoet/includes/class-mailpoet-cf7-integration.php:235
Stack trace:
#0 /home/xxxxx/public_html/wp-content/plugins/add-on-contact-form-7-mailpoet/includes/class-mailpoet-cf7-integration.php(123): MailPoet_CF7_Integration->mailpoet_segments_data(Array)
#1 /home/xxxxx/public_html/wp-content/plugins/contact-form-7/includes/form-tags-manager.php(551): MailPoet_CF7_Integration->mailpoet_signup_form_tag(Object(WPCF7_FormTag))
#2 /home/xxxxx/public_html/wp-content/plugins/contact-form-7/includes/form-tags-manager.php(460): WPCF7_FormTagsManager->scan_callback(Array, true)
#3 [internal function]: WPCF7_FormTagsManager->replace_callback(Array)
#4 /home/xxxxx/public_html/wp-content/plugins/contact-form-7/includes/form-tags-manager.php(356): preg_replace_callback('/(\\[?)\\[(mailpo...', Array, '<p><span style=...')
#5 /home/xxxxx/public_html/wp-content/plugins in /home/xxxxx/public_html/wp-content/plugins/add-on-contact-form-7-mailpoet/includes/class-mailpoet-cf7-integration.php on line 235