I logged in to look at stats the other day just to make sure everything looked ok. To my surprise, nobody had purchased since the change.
I fired up Mozilla Firefox, cleared my cookies, and went through the checkout process and things worked perfectly. I dug deeper to find the issue and decided to look at the pages using Internet Explorer. To my surprise, the state field was hidden when using Internet Explorer 7.
Here’s a nice tool you can use to double check next time before you launch “a small change” to your campaign pages. Enter your URL and get a screen shot of your page in all the major browsers. It’s worth the extra time.