I had some problems when I wanted to pledge earlier in that I just went to the bottom, put in my number and hit credit card and nothing happened. ( safari, with no obvious js errors in console. )
Thanks! As for the form, I'm guessing it was because the required email field (to send you your download link) was left unfilled. It's my bad, I didn't make the "please fill in this field" prompt obvious enough. I just left it as the HTML5 form validation default.
