I have the same problem, after installing BWP reCAPTCHA and Contact Form 7 reCAPTCHA extension plugins, I try to generate a tag by picking “BWP reCAPTCHA” and nothing shows up. This warning appears on the bottom of the page
Warning: Parameter 1 to BWP_RECAPTCHA_CF7::renderCf7BWPRecaptchaTagPane() expected to be a reference, value given in /…/plugin.php on line 470
