I went back and re-setup my site keys on the Google reCAPTCHA page and now it works. I had done this several times before and never had any luck. The only thing that I can see that I did differently this time was that I omitted the www. from the start of my domain. I don’t know whether this would or should have made a difference, but I can’t see anything else that I did differently from the 3-4 times I’ve tried re-setting my keys before. Just thought I’d let you know in case this is something that comes up in the future with someone else.
Thanks for the help.