GrahameNZ on "zpCaptcha"

Hi folks
Zenphoto version 1.4.6-BETA [4196c58634]
I can't get the zpCaptcha plugin to work.
I enable it but all it shows is the blue sorta file looking icon.
In the back end as an example.
And on the Contact form page.
If Captcha is ticked in the Contact form it shows as a field and the email can't be sent without the Caotcha being filled in, but only the blue icon shows, not a Captcha.
This is on the default theme as well as my modified zpBase.
This is on both my home server and my hosted server.
Any thoughts ???