I want to report that during the captcha phase in the freespin interface, sometimes there is the google recaptcha, sometimes another one I don't knwo the name.
When there is the google recapthca, a red message says "to site owner, invalid site key", the captcha is not functional. One or two refresh of the page usually loads the other non-google captcha that works.
I don't have captcha on free spins, but I get this error on WoF spins sometimes. For me it was enough just to reload page and error is gone. Though, this issue happens so rarely that I don't pay attention to it.