As I said, I’ve rolled back to CF7 5.0.5 and I’ve never had a problem with form submission with that version. The problem only exists with CF7 5.1.1 and the reCAPTCHA V2 plug-in. When it’s installed the submit button no longer works. If I delete the [recaptcha] tag from the form the button is active.
I’ve reactivated your plug in and updated CF7 to 5.1.1 so you can see the submit button is dead. Makes no difference on another PC or browser.
Any ideas appreciated or should I just stick with the previous CF7 version?