I have same issue – “circular arrow just keeps turning and turning and never completing the task”. When I look at the response of a POST submission I see following:
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<b>Warning</b>: unlink(C:\xampp\htdocs\xxx/wp-content/uploads/wpcf7_captcha/256345943.png): Permission denied in <b>C:\xampp\htdocs\xxx\wp-content\plugins\really-simple-captcha\really-simple-captcha.php</b> on line <b>219</b><br />
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<b>Warning</b>: unlink(C:\xampp\htdocs\xxx/wp-content/uploads/wpcf7_captcha/256345943.txt): Permission denied in <b>C:\xampp\htdocs\xxx\wp-content\plugins\really-simple-captcha\really-simple-captcha.php</b> on line <b>219</b><br />
{"mailSent":true,"into":"#wpcf7-f7-p102-o1","captcha":{"captcha-432":"http:\/\/www.mysite.com\/wp-content\/uploads\/wpcf7_captcha\/1967001199.png"},"message":"Your message was sent successfully. Thanks."}
So “Permission denied” is the issue, but I did not solve it yet. Hope this gives you a hint.
