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Try to call button.php directly. For example:
http://YOURWEBSITE.com/button.php
If there is no image, so.. your server may not support image creation functions.
In case you get something like here:
http://www.yugdesign.com/demo/CAPTCHA-form-Validation/button.php
So.. in this case you may misconfigurate the script. Check config.php, make sure you've edited font array for instance.
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