drupal 7 captcha image doesnt change - drupal-7

I have installed the captcha module into my drupal 7 website and have it displaying on two forms. It is working properly other than it is caching the captcha so it is the same when I do a refresh. If I go into the admin and turn off the cache they are still the same but if I go and hit the clear all caches button it changes to a new one the next time I go to the page.
Anyone have any ideas? Thank You.

simple following 3 steps and you get out from your error.
uninstall captcha module.
clear catch history
go to module page and enable captcha module.
it will work for you.

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I used a different theme = same problem.
I uploaded a new version of Drupal = same problem.
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If all else fails install Drupal 7 with NO modules enabled and see what you get. Then turn on each module on one at a time and see how that goes.

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DNN: 07.00.06
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