Broken image links in email archive

I've got an odd problem with broken image src URLs in the main article content of this email archive:
http://wmro.createsend.com/t/ViewEmailArchive/r/3067AED22D3FAE26/C67FD2F38AC4859C/

Looking in the source, the images aren't displaying because the image src URLs are appended with:

?v=233923

The images in all my other email archives (viewed via the script in Client Settings > Create newsletter archive) display fine. The image src URLs end in the file extension and no extra code is added.

Any ideas much appreciated.

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