Loaded fine on my end. Try CTRL+F5?
I've never encountered infinite loading captcha, but a similar error which instantly displays the captcha verification has failed (ERROR). By updating the page or quitting and clicking the link again it's possible to fix the issue. Have you tried that?
Otherwise, it could be a temporary issue with the captcha service provider, right?
I tried hard refresh (ctrl + F5) as well as clicking on the link again.
Matter of fact I tried on a different device as well. As in my mobile as well as my laptop.
Its weird since the issue is only for me. Tried different captchas on different sites and all are working fine except for the WoF.