Need to clear a cache 
Author: Arnold K.
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It is necessary to clear a cache after sending the post form because captcha is not clear. Users don't know about it and can't send next messages. Please make auto cleaning of cache in program.
Posted on the
Hello Arnold,
this depends on your user's browser settings. I suggest you add a message in your form stating that they should press F5 to reset their chache. That's the only thing you can do I'm afraid at the moment.