That worked for me.
1) Deactivate FSCF plugin
2) Rename (or delete) …/wp-content/plugins/si-contact-form/
3) Installed 3.1.8.5 zip file from http://downloads.wordpress.org/plugin/si-contact-form.3.1.8.5.zip
If you need to revert to an earlier version, instructions are here: http://www.fastsecurecontactform.com/revert-to-previous-version
3.1.8.5 has been reported as being OK.
WOW! I just noticed that all my forms are missing too. Obviously due to the recent update. Is there a remedy available yet or is anyone looking into this?
Thank You,