Hi from Switzerland,
Same problem here: all the input fields are frozen. I tried deactivate Contact From 7, delete all files for that plugin on the database, and re-install, but still does not work.
May be of interest to you: it’s not working with Safari Version 6.0.2 (7536.26.17), but with Firefox 17.0.1. you can input the fields, however Sweetcaptcha is frozen, i.e. making it impossible to send
Cheers from snowy Switzerland