Yeah, we're having some issues with getting the old photos to re-appearing across the whole of the forum post the recent software upgrade. It's weird; they're all here, they just don't seem to be being recognised as valid JPGs by whatever part of this setup is responsible for putting the images on the page. I'll take a look at how the newer images (i.e. those posted after the upgrade and which look fine) appear at the back end (minus Derek's tool*) and compare that to how the older images look.
In the meantime, Miles you could just edit your original post and re-upload the images?
* God bless Mr Bowman, eh Miles?