I'm getting what one would expect:

Cannot post comment, please correct these errors:
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So I'm guessing you fixed this?

Sorry but I can't help with the not centering problem :( It must be in your css but when I use webdeveloper to outline the current element and edit your css the nesting is extremely deep and you've got a lot of style sheets it pulls to try to find where recaptcha_area is styled. Then the table inside that holds all the recaptcha bits is another layer.

One thing I noticed is that recaptcha_widget_div recaptcha_area are divs with IDs, but your recaptcha_styles file uses a dot in front of a name. Perhaps that is a clue ... but I couldn't find anywhere that had styles for #recaptcha_widget_div or #recaptcha_area.

Weird that you don't get the error, I still see it and haven't found a way to fix it. Ive had others report it as well.

Anyways, Ive simply removed this plugin and switched to another Captcha plugin that fits my site better. It looks cleaner, centers correctly and does not throw out the error.

Thanks for the help.