I'm fairly good at debugging plugins, but I have never seen an Ajax request using the 'Options' action.
The form method and action appear correct - post and the page with #form-id
When looking in firebug, after clicking send, there is a request sent to OPTIONS, the url being the url of the page, with no response text or html.
I only have Akismet enabled and a custom theme with no js script includes at all. Latest wp version.
I added the error property to the jQuery ajaxForm in scripts.js to see what the error is and it has no response text, just a type of 'error'.
Any suggestions or other files I can debug? I really want to use Akismet with the contact form an have Never had an issue with Contact Form 7 - it's been the best!