reCaptcha was not solved or response was empty
Hello. I just noticed that my comment form stopped working. You can test it on this page for example:
This kind of problem is usually caused by either a conflict with your theme or with other plugins.
To find a problem maker one please deactivate plugins one by one and check after each deactivation. Then switch some default theme and check again.
Please keep the cache plugin deactivated during this testing process.