Image Verification no longer working

[VGPelega]

Hi there, I have recently moved server, but I am now no longer able to display the image verification image when someone tries to register.

Is there something that is required for this to work.

The image won't load at all, and just shows the alt text (even when refreshing the image)

Any assistance would be greatly appreciated.

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EDIT:
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I have removed the image verification and replaced it with questions. I would still like to know of this issue though, could it be down to the software on my new server, or that some files have been left on my old server after the migration??