After updating to 3.8.1 I'm getting this error:
Strict Standards: Non-static method EventOrganiser_Shortcodes::eo_clean_input() should not be called statically in /my/site/directory/beneaththeblindfold/wordpress/wp-content/plugins/event-organiser/classes/class-eventorganiser-shortcodes.php on line 255
Strict Standards: Non-static method EventOrganiser_Shortcodes::eo_clean_input() should not be called statically in /my/site/directory/beneaththeblindfold/wordpress/wp-content/plugins/event-organiser/classes/class-eventorganiser-shortcodes.php on line 256
I actually had to delete the plugin from the server to access WP Admin, then re-upload it and update before re-activating.