Er... I believe the skin is causing an issue. Now that I've made it the default, whenever a user goes to register and clicks "I agree to the TOS....", they get the message, "You have left a required field blank."
I wondered why we hadn't received a new user in the past two days LOL!
[edit] I tried out my other skins and they're all fine, so it has to be something with this skin.
[edit2] The problem was not doing the template edits for register_rules from having the Stop the Registration Bots, problem solved.