Captcha Image Issues

Hi there,

I am hoping that someone could possibly assist me or offer some advice on some captcha issues I am having with my site.

For some time now the captcha images on forms on the site have been a bit temperamental.  They work on some browsers without a problem, but on other machines simply don't display the captcha at all.

I've noticed it getting worse over time.

An example of a captcha page is here: example captcha page

Does anyone have any advice on how to address this?

If you need more information please let me know.

Thanks

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