I just installed Invisible Recaptcha 1.1, on a site with WP 4.9.1
I gave it protection to my login pages, and to a single Contact Form 7 form.
My CF7 form kept going to the orange border (fails to send due to “spam”).
And my WP login page stopped working… said my User/PW were wrong and wouldn’t let me in.
Other plugins I’m running:
Wordfence
Updraft
Easy WP SMTP
I disabled the Invisible Recaptcha’s CF7 form protect, then that form would send again.
Then I disabled the Invisible Recaptcha’s login form protect, and then my user/pw was accepted.
Charlie