I’am using W3 Total Cache with page basic, object, mysql and browser cache on.
When I clean all the cache on the browser and go to the post page no character is shown in the image(comment form), but when I submit the form(comment form) for the first time the characters appear.
I changed the file captcha_code_file.php, and added the following lines after line 10:
$characters_on_image = 4;
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